Réponse:
Bonjour,
4x - (x + 3) = 5 (x-1)
4x - x - 3 = 5x - 5
3x - 3 = 5x - 5
3x - 5x = -5 + 3
-2x = -2
x = - 2/-2
x = 1
3x - 2 (x - 4) = 5 + 4 (1 - 2x)
3x - 2x + 8 = 5 + 4 - 8x
x + 8 = 9 - 8x
x + 8x = 9 - 8
9x = 1
x = 1/9
2 (3x - 5) = 5x - 1
6x - 10 = 5x - 1
6x - 5x = -1 + 10
x = 9
Voilà,
Bonne continuation !!!