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  • Utilisateur Brainly
2014-09-20T22:16:23+02:00
3(x - 2) - 2(3x) = 7x - 12
3x - 6 - 6x = 7x - 12
- 6 + 12 = 7x - 3x + 6x
6 = 10x
6/10 = x
3/5 = x
2014-09-20T22:25:15+02:00

Bonsoir

On développe avant de résoudre

3 (x - 2) - 2(3x) = 7x - 12
3x - 6 - 6x = 7x - 12
 -7x + 3x - 6x =  6 -12
-10x = -6
 x = 6/10

 x = 3/5