Can someone give me a quick refresher on how to do this kind of problem?
Simplify (2m3 + 3m2 − 7m) − (5m3 − 9m).

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I don't remember how to do it. If you could just explain so I understand?

-3M^2+3M^3+2M is your answer. You can also use mathway.com for these answers

Explain how you got it please?

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