Réponses

2012-08-04T12:22:09+02:00

(x+1) + (x+2) - 2(x+3) = x+1-9

x+1+x+2- 2x-6-x = -8

1+2-6-x = -8

-x = -8-1-2+6

x = 5

 

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

7x - 2 - 2 + 4x + x = 2

12x = 6

x = 6/12

x = 1/2