bonsoir
- 5 x + 7 < 4 x - 3
- 5 x - 4 x < - 3 - 7
- 9 x < - 10
x > 10/9
12 x + 28 < 7 x + 8
12 x - 7 x < 8 - 28
5 x < - 20
x < - 4
