bonsoir
a. 8 - 4 x + 5 = - 6 x - 9 - 12
- 4 x + 6 x = - 9 - 12 - 8 - 5
2 x = - 34
x = - 17
b . 15 x + 5 = 20 x - 8
15 x - 20 x = - 8 - 5
- 5 x = - 13
x = 13/5
c. x /3 + 5/6 = 1/2 - x
2 x / 6 + 5 /6 = 3 /6 - 6 x / 6
2 x + 6 x = 3 - 5
8 x = - 2
x = - 2/8 = - 1/4
d . x - x - 1 = x + 3 - x + 3
x - x - x + x = 3 + 3 + 1
0 x = 7
pas de solution
