Respostas

2013-10-07T09:12:16-03:00
X - 7.6 : -12
x -42 : -12
x : -12 + 42
x : 30
1 1 1
2013-10-07T09:16:43-03:00
3x-7*6=-12
3x-42=-12
3x=-12+42
3x=30
x=30/3
x=10
1 1 1