bonjour
4 x - 8 - 5 = x - 18 - 6 x + 19
4 x - x + 6 x = - 18 + 19 + 8 + 5
9 x = 14
x = 14/9
9 x + 9 - 15 x + 10 = 7 x + 10 - 315 - 3 x
- 8 x - 7 x + 3 x = 10 - 315 - 9 - 10
- 12 x = - 324
x = 27
2 - 5 + 3 x = 35 + 63 x
3 x - 63 x = 35 - 2 + 5
- 60 x = 38
x = - 38/60 = - 19/30