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Intangible assets, net | 12 Months Ended
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Dec. 31, 2020
Intangible assets, net |
Intangible assets, net | 13. Intangible assets, net The composition and movement of intangible assets is as follows:
|  | Useful |  | Gross value |  | Accumulated amortization |  | Net carrying amount
|  | Life |  | At December 31,
|  | years |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
Software |  | 1 | – | 4 |  |  | Ps. | 704,257 |  | Ps. | 579,360 |  | Ps. | (512,695) |  | Ps. | (411,963) |  | Ps. | 191,562 |  | Ps. | 167,397
Balance as of January 1st, 2019 |  | Ps. | 179,124
Additions |  |  | 77,325
Disposals |  |  | —
Amortization |  |  | (87,667)
Exchange differences |  |  | (1,385)
Balance as of December 31, 2019 |  |  | 167,397
Additions |  |  | 124,724
Disposals |  |  | —
Amortization |  |  | (100,618)
Exchange differences |  |  | 59
Balance as of December 31, 2020 |  | Ps. | 191,562
Software amortization expense for the years ended December 31, 2020, 2019 and 2018 was Ps.100,618, Ps.87,667 and Ps.72,885, respectively. These amounts were recognized in depreciation and amortization in the consolidated statements of operations.

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- Definition The entire disclosure for intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&doctype=Standard&dita_xref=IAS38_g118-128_TI -URIDate 2020-01-01 + Details
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