Respostas

2014-07-20T14:01:15-03:00
-2x-7=17
-2x=17+7
-2x=24
x=24/2
x=12
2014-07-20T14:02:31-03:00
-2x-7=17
-2x=17+7
-2x=24
x=24/2
x=12