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Sagot :

Bonsoir

3x + 10=28

3x = 28 - 10

3x = 18

x = 18/3

x = 6

7-4x=11

- 4x = 11 - 7

- 4x = 4

x = - 4/4

x = - 1

9x-1=2x+7

9x - 2x = 7 + 1

7x = 8

x = 8/7.

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