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Sagot :

VINS

bonjour

- 4 x + 7 = 9 x -  2

- 4 x - 9 x = - 2 - 7

- 13 x = - 9

x = 9 /13

2 x + 6 - 9 x + 27 = 3 x + 21

- 7 x - 3 x = 21 - 6 - 27

- 10 x = - 12

x = 12/10 = 1.2

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