Réponses

2014-01-21T16:39:12+01:00
5x - 2 (3x + 1) = 2 (x - 7)
5x-2*3x-2*1=2*x 2*(-7)
5x-6x-2=2x-14
5x-6x-2x=-14+2
-3x=-12
x=-12/-3
x=4