Respostas

2014-03-13T14:42:30-03:00
A)
x + 1/3x = 24
4/3x = 24
x = 24/4/3
x = 24 * 3/4
x = 72/4
x = 18

b)
x + 12 = 3x
3x - x = 12
2x = 12
x = 12/2
x = 6