Jawabanmu

2014-06-06T13:38:39+07:00
64 = 63 . a + 1. 80
           a + 1
64 (a + 1) = 63a + 80
64a + 64 = 63a + 80
          a  = 80 - 64
          a = 16

maaf ya kalo salah :)