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\frac{\left(8m-72\right)\left(m^{2}-3m-28\right)}{\left(2m-14\right)\left(m^{2}-81\right)}
Divide \frac{8m-72}{2m-14} by \frac{m^{2}-81}{m^{2}-3m-28} by multiplying \frac{8m-72}{2m-14} by the reciprocal of \frac{m^{2}-81}{m^{2}-3m-28}.
\frac{8\left(m-9\right)\left(m-7\right)\left(m+4\right)}{2\left(m-9\right)\left(m-7\right)\left(m+9\right)}
Factor the expressions that are not already factored.
\frac{4\left(m+4\right)}{m+9}
Cancel out 2\left(m-9\right)\left(m-7\right) in both numerator and denominator.
\frac{4m+16}{m+9}
Expand the expression.
\frac{\left(8m-72\right)\left(m^{2}-3m-28\right)}{\left(2m-14\right)\left(m^{2}-81\right)}
Divide \frac{8m-72}{2m-14} by \frac{m^{2}-81}{m^{2}-3m-28} by multiplying \frac{8m-72}{2m-14} by the reciprocal of \frac{m^{2}-81}{m^{2}-3m-28}.
\frac{8\left(m-9\right)\left(m-7\right)\left(m+4\right)}{2\left(m-9\right)\left(m-7\right)\left(m+9\right)}
Factor the expressions that are not already factored.
\frac{4\left(m+4\right)}{m+9}
Cancel out 2\left(m-9\right)\left(m-7\right) in both numerator and denominator.
\frac{4m+16}{m+9}
Expand the expression.