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3mm^{2}-3m^{3}
The opposite of -3m is 3m.
3m^{3}-3m^{3}
To multiply powers of the same base, add their exponents. Add 1 and 2 to get 3.
0
Combine 3m^{3} and -3m^{3} to get 0.
3\left(mm^{2}-m^{3}\right)
Factor out 3.
0
Consider m^{3}-m^{3}. Factor out m^{3}.
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Limits
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