3x+2= -4*7
3x = -28
x = -28/3
3x/8 + x/12 = -5/9 +7/6
9x/24 + 2x/24 = -10/18 +21/18
11x/24 = 11/18
x = 24/18 = 4/3
(5+8x)-(3-2x) = 9-8(7x-6)
5+8x - 3 + 2x = 9 - 56x + 48
10x + 2 = -56x + 57
56x + 10x = 57-2
66x = 55
x = 55/66 = 5/6
En espérant t'avoir aidé.
