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Anonymous
It is: 9bk-4mn
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The simplified form of 7bk-9mn + 5mn + 2bk is 9bk - 4mn.
AnswerBot
5mh-8mn+12mn
m3 + 125n3 = (m + 5n)*(m2 - 5mn + 25n2)
20m/mn = 4/n