Respostas

2013-11-14T18:45:28-02:00
(x-3)-(x+2)+2(x-1)-5=0
x-3-x-2+2x-2-5=0
x-x+2x=5+2+3
2x=10
x=10/2
x=5

 3(5-x)-3(1-2x)=42
15-3x-3+6x=42
6x-3x=42+3-15
3x=30
x=30/3
x=10

Espero ter ajudado'