Bonsoir
a) 4 (2 - x) + 5 = - 3 * 2x - 12
8 - 4x + 5 = - 6x - 12
- 4x + 6x = - 12 - 8 - 5
2x = - 25
x = - 25/2
x = - 12,5
b) x - (2x + 1) = 4 (x + 3)
x - 2x - 1 = 4x + 12
x - 2x - 4x = 12 + 1
- 5x = 13
x = - 13/5
c) (5x + 2) * 3 + 1 = x
15x + 6 + 1 = x
15x - x = - 1 - 6
14x = - 7
x = - 7/14
x = - 1/2
d) 4 (x - 5) = 6 (- x + 2)
4x - 20 = - 6x + 12
4x + 6x = 12 + 20
10x = 32
x = 32/10
x = 3,2
e) (3x + 1) / 4 = (5x - 2) / 5
15x + 5 = 20x - 8
15x - 20x = - 8 - 5
- 5x = - 13
x = 13/5
f) (4 + x) / 8 = (2x - 9) / 3
12 + 3x = 16x - 72
3x - 16x = - 72 - 12
- 13x = - 60
x = 60/13.
