Respostas

2013-09-07T12:22:35-03:00
Eu fiz assim, olha:

1/4 . 2/5 = 2x+8
2/20 = 2x + 8 
2x = 2/20 - 8

2x = 2/20 - 8/1 .(20)
2x = 2/20 - 160/20 
2x= -158/20
x = -158/20 / 2 => -158/20. 1/2= -158/40= -3,95