Bonsoir je c'est exercice à faire merci

bonsoir

x  + 7 = - 16
x = - 16 - 7
x = - 23

3 x - 4 = 10
3 x = 10 + 4
3 x = 14
x = 14/3

3 x - 18 = 5 x - 10
3 x - 5 x = - 10 +18
- 2 x = 8
x = - 4

5 x - 2 - 2 x - 1 = 2 x - 14
3 x - 2 x = - 14 + 2 + 1
x = - 11