Respostas

2014-08-07T15:48:01-03:00
A - 5 = 2a
2a - a = -5
a = -5

b/2 = 3
b = 3 . 2
b = 6

2x + 3 = 13
2x = 13 - 3
2x = 10
x = 10/2
x = 5
2 3 2