Réponses

2013-11-12T18:02:07+01:00
-2(4x+1)+5(x+2)=-7
-8x-2+5x+10=-7
-8x+5x=-7+2-10
-3x=-15
x=5

23-7(2x-12)=x-14(5+x)
23-14x+84=x-70-14x
-14x-x+14x=-70-23-84
-x=-177
x=177
2013-11-12T18:10:12+01:00
-2(4x+1)+5(x+2)= -7
-8x-2+5x+10=-7
-8x+5x=-7-10+2
-3x=-15
3x=15
x=15/3
x=5

23-7(2x-12)=x-14(5+x)
23-14x+84=x-70-14x
-14x+14x-x=-70-23-84
-x=-177
x=177