Exercice 18! Aidez moi !

A) 2x +6-6=0-6
2x=-6
x = -6/2 = -3

B) 4x = 0
0/4=0 =x

C) 5x=15
15/5=3 =x

D) 3x+3-3=12-3
3x=9
9/3 = 3 =x