Réponses

2013-04-01T15:36:23+02:00
9x + 1 = -3x - 5
9x + 1 - 1 = -3x - 5 - 1
9x = -3x - 6
9x + 3x = -3x - 6 + 3x
12x = -6
12x/12 = 6/12
X = 0,5


2013-04-01T15:38:34+02:00

9x + 1 + 3x = -3x - 5 + 3x

12x + 1 - 1 = - 5 - 1

12x / 12 = - 6 / 12

x = - 0,5

 

3 - (2 - 5x) = 7(x + 1)

3 - 2 + 5x - 7x = 7x + 7 - 7x

1 - 2x - 1 = 7 - 1

- 2x / 2 = 6 / 2

x = 3