Réponses

2014-01-20T22:26:50+01:00
(5x+7) (x+1)=(5x-7) (3x+2)
(5x+7) (x+1)-(5x-7) (3x+2) = 0
(5x+7)(x+1-3x-2) = 0
(5x+7)(-2x-1) = 0

2 solutions :
x=-7/5 ou x=-1/2

En espérant t'avoir aidé.