bonsoir
2 x + 12 + 5 x + 20 = x + 1
7 x - x = 1 - 12 - 20
6 x = - 31
x = - 31/ 6
6 x - 10 = 12 x + 32
6 x - 12 x = 32 + 10
- 6 x = 42
x = - 7
2 x /3 + 4/5 = 3 x / 6 - 3 /5
20 x /30 + 24 /30 = 15 x /30 - 18/30
20 x - 15 x = - 18 - 24
5 x = - 42
x = - 42/5
3 x + 12 + 6 x+ 12 = 0
9 x = - 12 - 12
9 x = - 24
x = - 24/9 = - 8 /3
