bonsoir
2 x - 14
- 3 x + 3
2 x - 14 = - 3 x + 3
2 x + 3 x = 3 + 14
5 x = 17
x = 17/5
42 - 14 x - 12 x - 3 = 0
- 26 x = - 42 + 3
- 26 x = - 39
x = 39/26 = 3/2