Respostas

2014-01-30T18:00:21-02:00
X=12

3.(x-8) =

3.(12-8)

3.4 =
12

x=12
2 2 2
2014-01-30T18:13:44-02:00
Substitua o x por 12

3.(x-8) 
3.(12-8)
3.4 = 12