résoudre chaque équation: (les signes x ne sont pas les signes de multiplications mais la lettre X) a) 5x-3=6-3x b) 7-4x=-3+2x c) 3(5-2x)=7-4x d) 3-(2x-4)=x

a) 5x - 3 = 6 - 3x
5x + 3x = 6 + 3
8x = 9
x = 9/8
x = 1,125

b) 7 - 4x = - 3 + 2x
- 4x - 2x = - 3 - 7
- 6x = - 10
x = - 10 / (- 6)
x = 10/6
x = [tex] \frac{10 / 2}{6 / 2} [/tex]
x = 5/3

c) 3 (5 - 2x) = 7 - 4x
15 - 6x = 7 - 4x
- 6x + 4x = 7 - 15
- 2x = - 8
x = - 8 / (- 2)
x = 4

d) 3 - (2x - 4) = x + 7
3 - 2x + 4 = x + 7
- 2x - x = 7 - 4 - 3
- 3x = 0
x = - 0/3
x = 0