Réponse :
1)
5x + 2 = 2x + 6
5x + 2 - 2 = 2x + 6 - 2
5x = 2x + 4
5x - 2x = 4
3x = 4
x = 4/3
2)
2(3x + 3) = -2(x - 7)
6x + 6 = -2x + 14 (distribution)
6x + 6 - 6 = -2x + 14 - 6
6x = -2x + 8
6x/-2 = -2x/-2 + 8
-3x = x + 8
-3x - 8 = x
x - 8 = x + 3
x - 8 + 8 = x + 3 + 8
x = x + 11
x - x = 11
-x/-1 = 11/-1
x = -11
