Respostas

2013-10-30T17:00:25-02:00
12x+4=7(2x-8)
12x+4=14x-56
12x-14x=-56-4
-2x=-60
-x=-60/2  (-1)
x= -60/2
x= 30
2013-10-30T17:01:42-02:00
12x+4=14x - 56
12x-14x= -56-4
-2x= -60
x= -60/-2
x=30