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Sagot :

REGINEGALMAR

Réponse :

3x - 8 = x + 12

3x - x = 12 + 8

2x = 20

x = 20/2 = 10

Explications :
3x -8 +8= x + 12 + 8
3x = x +20
3x -x = x + 20 -x
2x = 20
2x/2 = 20/2
x = 10

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