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loves2ballet
Well the 4 would have to be distributed into the 12 and m so you would have 9m+48-4m.
Then you would have to take 9m and subtract 4m from it so it would be 5m+48 and that would be your answer!!! 
Hope it helps
choixongdong
9m + 4 (12 -m) 
= 9m + 48 - 4m
= 5m + 48

hope it helps