Respostas

2014-03-20T00:44:09-03:00
(3a+6)/8 = (2a+10)/6
(3a+6)*6 = (2a+10)*8
18a+36 = 16a+80
18a-16a = 80-36
2a = 44
  a = 44/2
  a = 22

Conferindo se está certo: 

(3*22+6)/8 = (2*22+10)/6
72/8 = 54/6
    9 = 9