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Sagot :

VINS

Réponse :

bonjour

3 x - 9 = 12

3 x = 12 + 9

3 x = 22

x = 22/3

5 x - 1 = 3 x + 9

5 x - 3 x = 9 + 1

2 x = 10

x = 10/2  = 5

- x + 5 = 5 x + 35

- x - 5 x = 35 - 5

- 6 x = 30

x = - 5

Explications étape par étape

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