bonjour
- 15 x + 14 = - 2 x + 7
- 15 x + 2 x = 7 - 14
- 13 x = - 7
x = 7/13
- 15 x - 6 = 15 x + 17
- 15 x - 15 x = 17 + 6
- 30 x = 23
x = - 23/30
27 x + 10 = - 14 x + 9
27 x + 14 x = 9 - 10
41 x = - 1
x = - 1 /41
fais le dernier, tu devrais avoir compris normalement
