resoudre les équations suivantes (du 1er degré niveau 4eme) a)1-x/3=2 b)3x=x-55/4 c)x/3-x/2=5/6

(1 - x)/3 = 2
1 - x = 3 * 2
- x = 6 - 1
- x = 5
x = - 5

3x = x - 55/4
3x - x = - 55/4
2x = - 55/2
4x = - 55
x = - 55/4

x/3 - x/2 = 5/6
2x - 3x = 5
- x = 5
x = - 5