Explications étape par étape:
a) 5 (x-1) = 2 (3x+2)
5x-5 = 6x+4
5x-6x = 4+5
-x = 9
x= -9
b) 2 (3x+1) - 5 (6-x) = 2-x
6x+2-30+5x = 2-x
6x-30+5x = -x
11x-30 = -x
11x + x = 30
12x+30
Solution = x=5
2
