Answers

2015-08-15T13:32:14+08:00
16m+{-12p-[5m-(4m+8p)]}+17m
16m+[-12p-(5m-4m-8p)]+17m
16m+(-12p-5m+4m+8p)+17m
16m-12p-5m+4m+8p+17m
=32m-4p
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