Jawabanmu

2014-08-18T22:13:55+07:00
(30x3) - (20x-/6) + (42x3) - (28x-/6)
=90 + 126 - 48-/6
=216 - 48-/6
=36 - 8-/6
=9 - 2-/6
Semoga membantu