bjr
3x - 3 = 3
les x à gauche - les constantes (nombres) à droite
3x - 3 + 3 = 3 + 3
3x = 6
3x/3 = 6/3
x = 2
5z - 10 = 12
5z - 10 + 10 = 12 + 10
5z = 22
5z/5 = 22/5
z = 4,4
3 - y = 0
3 = y
1 + 5x = -29
5x + 1 - 1 = - 29 - 1
5x = -30
5x/5 = -30/5
x = -6
tu as compris :)