Respostas

2014-02-22T21:02:00-03:00
2*6y -7y = 10
12y - 7y = 10
5y = 10
y = 2
2014-02-22T21:06:40-03:00
2(6y)-7y=10
12y-7y=10
5y=10
y=10/5
y=2