bonjour
1) x - 1 = - 11
x = - 11 + 1
x = - 10
2) 4 x = 5
x = 5/4
3) 3 x + 5 = - 7
3 x = - 7 - 5
3 x = - 12
x = - 12/3 = - 4
4) 6 x + 5 = 7 x - 4
6 x - 7 x = - 4 - 5
- x = - 9
x = 9
5) - 2 x - 3 = 3 x - 28
-2 x - 3 x = - 28 + 3
- 5 x = - 25
x = 25/5 = 5
6) 1 - 3 x - 12 = 3 + 4 x - 4
- 3 x - 4 x = 3 - 4 - 1 + 12
- 7 x = 10
x = - 10/7
7) 2 x/3 = 4
2 x /3 = 12/3
2 x = 12
x = 6
8) 2 x /3 + 1 = - 1/3
2 x / 3 + 3/3 = - 1/3
2 x = - 1 - 3
2 x = - 4
x = - 2