Bonjour,
5x - 3 = x - 5
5x - x = - 5 + 3
4x = - 2
x = - 2/4
x = - 1/2
7x + 5 = -3x + 2
7x + 3x = 3 - 5
10x = - 2
x = - 2/10
x = - 1/5
2(x - 5) = 3 ( - x + 5)
2x - 10 = - 3x + 15
2x + 3x = 15 + 10
5x = 25
x = 25/5
x = 5
-3 ( -a + 3 ) =5 ( 3 -a ) +2
3a - 9 = 15 - 5a + 2
3a + 5a = 15 + 2 + 9
8a = 26
a = 26/8
a = 13/4