Respostas

2014-02-01T17:41:11-02:00
2(x-15)=8x
2x-30=8x
2x-8x=30
-6x=30
x=-30/6
x=-5

6(3x+5)=5(8x+6)
18x+30=40x+30
18x-40x=30-30
-22x=0
x=0/22
x=0

-(x+8)=2(4x+5)
-x-8=8x+10
-x-8x=10+8
-9x=18 (-1)
9x=-18
x=-18/9
x=-2