Résoudre: 8x-4=5x+8 3-7x=2x+30 3x-(x-2)=10-4x 5(2x-1)+3=2(4x+1) x sur 5+6=-2

bonjour

8 x -4 = 5 x +8
8 x - 5 x = 8 + 4
3 x = 12
x = 12/3 = 4

3 - 7 x = 2 x + 30
- 7 x - 2 x = 30 - 3
- 9 x = 27
x = - 27/9 = - 3 

3 x - x + 2 = 10 - 4 x
2 x  + 4 x = 10 - 2
6 x = 8
x = 8/6 = 4/3

10 x - 5 + 3 = 8 x + 2
10 x - 8 x = 2 + 5 -3
2 x = 4
x = 4/2 = 2

x + 5/6 = - 2
6 x + 5 = - 12
6 x = - 12 - 5
6 x = - 17
x = - 17/6