Respostas

2013-12-04T19:43:26-02:00
3x-5=x+7
3x-x=7+5
2x=12
x=12/2
x=6
1 1 1
2013-12-04T19:46:20-02:00
3x-5=x+7
3x-x=7+5
2x=12
x=12/2
x=6

Espero ter ajudado ^^