Jawabanmu

2014-08-21T14:07:08+07:00
Jawaban paling cerdas!
2014-08-21T14:09:14+07:00
(5a-6+ab)+(7a-6+ab) = 5a+7a+ab+ab-6-6
                              = 12a+2ab-12
      semoga membantu :)
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