31It follows that the conditions laid down in the national laws, to which Article 6(1) of Directive 93/13 refers, may not adversely affect the substance of the right that consumers acquire under that provision not to be bound by a term deemed to be unfair (judgments of 21 December 2016, Gutiérrez Naranjo and Others, C‑154/15, C‑307/15 and C‑308/15, EU:C:2016:980, paragraph 71, and of 26 January 2017, Banco Primus, C 421/14, EU:C:2017:60, paragraph 51).
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