Réponses

2014-05-11T12:14:13+02:00
7x = - 1
x = -1/7

- 3x = 12
-x = 12/3
x = - 4

-12x = - 144
-x = - 144/12
x = 12

3x + 2 = 5
3x = 5 - 2
3x = 3
x = 3/3
x = 1

-7x + 2 = - 12
- 7x = - 12 - 2
- 7x = - 14
x = 14/7
x = 2
2014-05-11T12:15:40+02:00
7x=-1    x=-1/7

-3x=12      x=-12/3=-4

-12x=-144    x=-144/-12=12

3x+2=5    3x=5-2=3    x=3/3=1

-7x+2=-12      -7X=-12-2=-14    x=-14/-7=2