Explications étape par étape :
a) 3x = 2x + 5
x = 5
b) 4 + 5x = 9x
4 = 4x
x = 1
c) x + 2 = 4x + 11
-3x = 9
x = -3
d) -10x + 8 = -13x - 2
3x = -10
x = -10/3
e) 5x - 1 = 7x - 1
-2x = 0
x = 0
f) -3x + 1 = 2(x-3)
-3x + 1 = 2x -6
-5x = -7
x = 7/5
g) -0,5x - 7 = -4x - 1
3,5x = 6
x = 6/3,5
x = 12/7 (sans virgule)
h) 3x - 2 + x = 6 + 4x
4x - 2 = 6 + 4x
0x = 8
pas de solution
