Respostas

2013-08-07T11:15:33-03:00
7x=2x+45
7x - 2x = 45
5x = 45
x = 45/5
x = 9
1 5 1
2013-08-07T11:15:44-03:00
7x=2x+45
7x-2x=45
5x=45
x=45/5=9

1 2 1