Réponses

2014-04-09T13:26:39+02:00
Bonjour

7x - (3x + 9 ) = 6(x-8) - 2(x+4)
7x - 3x -9 = 6x - 48 - 2x -8
4x -6x +2x = -48 -8 +9
0x = - 45
x = 0