bonjour
3 x + 5 = 7
3 x = 7 - 5
3 x = 2
x = 2/3
3 - 7 x = 3
- 7 x = 3 - 3
- 7 x = 0
x = 0
- 6 x /8 + 1 /7 = 1
- 42 x /56 = 56/56 - 8/56
- 42 x = 48
x = - 48/42 = - 8/7
9 - 4 x = 0
- 4 x = - 9
x = 9/4
3 x + 3 = 6 x - 2
3 x - 6 x = - 2 - 3
- 3 x = - 5
x = 5 /3
x/5 = 3 /8
8 x = 15
x = 15/8
