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-3m-6
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-3m-6
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\frac{42m^{3}+21m^{4}}{-7m^{3}}
Combine -28m^{4} and 49m^{4} to get 21m^{4}.
\frac{21\left(m+2\right)m^{3}}{-7m^{3}}
Factor the expressions that are not already factored.
\frac{3\left(m+2\right)}{-1}
Cancel out 7m^{3} in both numerator and denominator.
-3m-6
Expand the expression.
\frac{42m^{3}+21m^{4}}{-7m^{3}}
Combine -28m^{4} and 49m^{4} to get 21m^{4}.
\frac{21\left(m+2\right)m^{3}}{-7m^{3}}
Factor the expressions that are not already factored.
\frac{3\left(m+2\right)}{-1}
Cancel out 7m^{3} in both numerator and denominator.
-3m-6
Expand the expression.
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