BhG 5.5

syntax

sāṅkhyaiḥ (by followers of sāṁkhya) yat sthānam (that position which) prāpyate (it is obtained),
yogaiḥ api (by followers of yoga, too) tat (that) gamyate (it is reached).
yaḥ (he who) sāṅkhyaṁ ca (and sāṁkhya) yogaṁ ca (and yoga) ekam (one) paśyati (he sees),
saḥ (he) [samyak] (properly) paśyati (he sees).

grammar

yat	–	yat sn. 2n.1 n. – that which;
sāṁkhyaiḥ	–	sāṁkhya 3n.3 m. – by followers of sāṁkhya (from: sam-√khyā – to count, sāmkhya – relating to number, rational, one of the schools of Hindu philosophy);
prāpyate	–	pra-√āp (to obtain, to reach) Praes. pass. 1v.1 – it is obtained;
sthānam	–	sthāna 2n.1 n. – state, place, position (from: √sthā – to stand);
tat	–	tat sn. 2n.1 n. – that;
yogaiḥ	–	yoga 3n.3 m. – by followers of yoga (from:√yuj – to yoke, to join, to engage, yoga – yoga, yoking, application, a means, one of the schools of Hindu philosophy);
api	–	av. – although, moreover, besides, even;
gamyate	–	√gam (to go) Praes. pass. 1v.1 – it is reached;
ekam	–	eka sn. 2n.1 n. – one;
sāṁkhyam	–	sāṁkhya 2n.1 n. – sāmkhya (from: sam-√khyā – to count, sāmkhya – relating to number, rational, one of the schools of Hindu philosophy);
ca	–	av. – and;
yogam	–	yoga 2n.1 m. – yoga, yoking, application, a means, one of the schools of Hindu philosophy (from:√yuj – to yoke, to join, to engage);
ca	–	av. – and;
yaḥ	–	yat sn. 1n.1 m. – he who;
paśyati	–	√dṛś (to see) Praes. P 1v.1 – he sees;
saḥ	–	tat sn. 1n.1 m. – he;
paśyati	–	√dṛś (to see) Praes. P 1v.1 – he sees;

textual variants

sthānaṁ → jñānaṁ (knowledge);
api gamyate → anugamyate / anugīyate / adhigamyate (it is reached / it is sung / it is obtained);

The fourth pada of verse 5.5 is the same as the fourth pada of verse BhG 13.27;

Śāṃkara

ekasyāpi samyag anuṣṭhānāt katham ubhayoḥ phalaṃ vindate ? ity ucyate—

yat sāṃkhyair jñāna-niṣṭhaiḥ saṃnyāsibhiḥ prāpyate sthānaṃ mokṣākhyaṃ tad yogair api jñāna-prāpty-upāyatveneśvare samarpya karmāṇy ātmanaḥ phalam anabhisaṃdhāyānutiṣṭhanti ye te yogā yoginaḥ | tair api paramārtha-jñāna-saṃnyāsa-prāpti-dvāreṇa gamyata ity abhiprāyaḥ | ata ekaṃ sāṅkhyaṃ ca yogaṃ ca yaḥ paśyati phalaikatvāt sa paśyati samyak paśyatīty arthaḥ

Rāmānuja

etad eva vivṛṇoti

sāṃkhyaiḥ jñānaniṣṭhaiḥ / yad atmāvalokanarūpaṃ phalaṃ prāpyate, tad eva karmayoganiṣṭhair api prāpyate / evam ekaphalatvena ekaṃ vaikalpikaṃ sāṃkhyaṃ yogaṃ ca yaḥ paśyati, sa paśyati sa eva paṇḍita ityarthaḥ

Śrīdhara

etad eva sphuṭayati yat sāṃkhyair iti | sāṃkhyair jñāna-niṣṭhaiḥ saṃnyāsibhir yat sthānaṃ mokṣākhyaṃ prakarṣeṇa sākṣād avāpyate, yogair ity ārśa āditvān matv-arthīyo ‚c-pratyayo draṣṭavyaḥ | tena karma-yogibhir api tad eva jñāna-dvāreṇa gamyate ‚vāpyate | ataḥ sāṃkhyaṃ ca yogaṃ ca ekaphalatvena ekaṃ yaḥ paśyati sa eva samyak paśyati

Madhusūdana

ekasyānuṣṭhānāt katham ubhayoḥ phalaṃ vindate tathāha yat sāṃkhyair iti | sāṅkhyair jñāna-niṣṭhaiḥ saṃnyāsibhir aihika-karmānuṣṭhāna-śūnyatve ‚pi prāg-bhavīya-karmabhir eva saṃskṛtāntaḥ-karaṇaiḥ śravaṇādi-pūrvikayā jñāna-niṣṭhayā yat prasiddhaṃ sthānaṃ tiṣṭhaty evāsmin na tu kadāpi cyavata iti vyutpattyā mokṣākhyaṃ prāpyata āvaraṇābhāva-mātreṇa labhyata iva nitya-prāptatvāt, yogair api bhagavad-arpaṇa-buddhyā phalābhisandhi-rāhityena kṛtāni karmāṇi śāstrīyāṇi yogās te yeṣāṃ santi te ‚pi yogāḥ | arśa-āditvān matv-arthīyo ‚c-pratyayaḥ | tair yogibhir api sattva-śuddhyā saṃhyāsa-pūrvaka-śravaṇādi-puraḥ-sarayā jñāna-niṣṭhayā vartamāne bhaviṣyati vā janmani sampatsyamānayā tat sthānaṃ gamyate | ata eka-phalatvād ekaṃ sāṃkhyaṃ ca yogaṃ ca yaḥ paśyati sa eva samyak paśyati nānyaḥ |

ayaṃ bhāvaḥ yeṣāṃ saṃnyāsa-pūrvikā jñāna-niṣṭhā dṛśyate teṣāṃ tayaiva liṅgena prāg-janmasu bhagavad-arpita-karma-niṣṭhānumīyate | kāraṇam antareṇa kāryotpatty-ayogāt | tad uktam –

yāny ato ‚nyāni janmāni teṣu nūnaṃ kṛtaṃ bhavet |
yat kṛtyaṃ puruṣeṇeha nānyathā brahmaṇi sthitiḥ || iti |

evaṃ yeṣāṃ bhagavad-arpita-karma-niṣṭhā dṛśyate teṣāṃ tayaiva liṅgena bhāvinī saṃnyāsa-pūrvajñāna-niṣṭhānumīyate sāmagryāḥ kāryāvyabhicāritvāt | tasmād ajñena mumukṣuṇāntaḥkaraṇa-śuddhaye prathamaṃ karma-yogo ‚nuṣṭheyo na tu saṃnyāsaḥ | sa tu vairāgya-tīvratāyāṃ svayam eva bhaviṣyatīti

Viśvanātha

etad eva spaṣṭayati yad iti | sāṃkhyaiḥ sannyāsena yogair niṣkāma-karmaṇā | bahu-vacanaṃ gauraveṇa | ataeva tad dvayaṃ pṛthag-bhūtam api yo vivekenaikam eva paśyati sa paśyati, cakṣuṣmān paṇḍita ity arthaḥ

Baladeva

etad viśadayati yad iti | sāṃkhyair jñāna-yogibhir yogaiḥ niṣkāma-karmabhiḥ | arśa ādy ac | sthānaṃ ātmāvaloka-lakṣaṇam | ataeva tad dvayaṃ nivṛtti-pravṛtti-rūpatayā bhinna-rūpam api phalaikyād ekaṃ yaḥ paśyati vetti, sa paśyati sa cakṣuṣmān paṇḍita ity arthaḥ