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Sagot :

Réponse :

Explications étape par étape :

D) = 7x - 3 = 5 - x

7x - 3 = 5 - x

7x + x = 5 + 3

8x = 8

x = 8/8 = 1

(E) = -x + 3 = 12 - x

-x + 3 = 12 - x

-x + x = 12 - 3

 pas de solution

(F) = x² - 9 = (x - 3)(x + 3)

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