(4m3-2m2+m-9)-(9m3-3m2-4m+7)
4m3-2m2+m-9-9m3+3m2+4m-7
4m3-9m3-2m2+3m2+m+4m-9-7
-5m3+m2+5m-16
The simplified version of that is -5m3+m2+5m-16
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