Jawabanmu

2014-02-17T18:42:29+07:00
7 - 3 - y = 3(3-3y) - 3(1-2y) =
7 - 3 - y = 9 - 9y - 3 + 6y =
4 - y = 6 - 3y =
-y + 3y = 6 - 4 =
2y = 2
y = 1
1 5 1