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Sagot :

Bjr,

12x - 45 = - 27

12x = - 27 + 45

12x = 18

x = 18/12 = 9/6 = 3/2

3x - 7 = 4x + 1

3x - 4x = 1 + 7

- x =  8

x = - 8    

3(2x + 4) = - 18 - 4x

6x + 12 = - 18 - 4x

6x + 4x = - 18 - 12

10x = - 30

x = - 30/10 = - 3

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