Réponses

Meilleure réponse !
2014-04-08T19:04:32+02:00
3x+7+2 (x-1)=(x+2)+3 (x+1)            
3x+7+2x-2=x+2+3x+3
5x+5 = 4x +5
5x-4x =5-5
x = 0