bonjour
7 x - 4 = 5 x + 6
7 x - 5 x = 6 + 4
2 x = 10
x = 10/2 = 5
3 - 2 x = - 9 + 3 x
- 2 x - 3 x = - 9 - 3
- 5 x = - 12
x = 12/5
4.3 x + 12 = 33 - 5.7 x
4.3 x + 5.7 x = 33 - 12
10 x = 11
x = 11/10 = 1.1
3 x - 2 x + 8 = 5 + 4 - 8 x
x + 8 x = 9 - 8
9 x = 1
x = 1/9