Respostas

2013-10-30T21:45:26-02:00
-7x+3=-12
-7x=-12-3
-7x=-15
x=-15/7

1 4 1
2013-10-30T21:45:29-02:00
-7x+3=-12
-7x=-12-3
-7x=-15
(-1)-7x=-15(-1)
7x=15
x=15/7
2 5 2