bonsoir
3 x + 1 = 2 x - 4
3 x - 2 x = - 4 - 1
x = - 5
5 x + 2 = - 9 x + 3
5 x + 9 x = 3 - 2
14 x = 1
x = 1/14
3 x - 3 + 2 x = - 4 x + 5
5 x - 3 = - 4 x + 5
5 x + 4 x = 5 + 3
9 x = 8
x = 8/9
5 x + 35 - 2 = 3 x - 3 + 4
5 x + 33 = 3 x + 1
5 x - 3 x = 1 - 33
2 x = - 32
x = - 16