Réponses

2013-04-03T19:10:39+02:00
2a+5=6
2a=6-5=1
a=1/2

4b-1=7
4b=7+1=8
b=8/4=2

-3x+11=-8x-9
-3x+8x=-9-11
5x=-20
x=-20/5=-4

2(3y+7)=5(-2y+1)
6y+14=-10y+5
6y+10y=5-14
16y=-9
y=-9/16