Respostas

2014-02-06T19:26:40-02:00
6(2x-5)=2x+20
12x-30=2x+20
12x-2x=20+30
10x=50
x=50/10
x=5


9x-9=2x+40
9x-2x=40+9
7x=49
x=49/7
x=7

2x-11=-6x+37
2x+6x=37+11
8x=48
x=48/8
x=6
2 4 2