Réponse :
a) 2x - 8 = 3
2x = 3 + 8
2x = 11
x = 11/2
b) 5x - 12 = 20
5x = 32
x = 32/5
c) 4x + 10 = 2x
4x - 2x = -10
2x = -10
x = -10/2 = -5
d) 8x +10 = 2x -15
8x - 2x = -15 - 10
6x = -25
x = -25/6
e) 8(5+x) = 100
40 + 8x = 100
x = 60/8 = 15/2
Explications étape par étape
