Respostas

2013-10-02T17:03:28-03:00
-10+4-2x=-4x-7
-2x+4x = -7+10-4
2x = -1
x = -1/2
1 5 1
2013-10-02T17:04:00-03:00
-2x+4x=10-4-7
2x=-1
x=-1/2 (menos um meio)
1 5 1