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Sagot :

Bonjour.

2x + 5 = 7

⇔ 2x = 7 - 5

⇔ 2x = 2

⇔ x = 2/2

x = 1

Vérification :

2 × 1 + 5 = 2 + 5 = 7

Bonne journée !

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