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\frac{\left(b^{2}-11b+28\right)\left(b^{2}-4b-32\right)}{\left(b^{2}-12b+32\right)\left(b^{2}+4b\right)}
Divide \frac{b^{2}-11b+28}{b^{2}-12b+32} by \frac{b^{2}+4b}{b^{2}-4b-32} by multiplying \frac{b^{2}-11b+28}{b^{2}-12b+32} by the reciprocal of \frac{b^{2}+4b}{b^{2}-4b-32}.
\frac{\left(b-8\right)\left(b-7\right)\left(b-4\right)\left(b+4\right)}{b\left(b-8\right)\left(b-4\right)\left(b+4\right)}
Factor the expressions that are not already factored.
\frac{b-7}{b}
Cancel out \left(b-8\right)\left(b-4\right)\left(b+4\right) in both numerator and denominator.
\frac{\left(b^{2}-11b+28\right)\left(b^{2}-4b-32\right)}{\left(b^{2}-12b+32\right)\left(b^{2}+4b\right)}
Divide \frac{b^{2}-11b+28}{b^{2}-12b+32} by \frac{b^{2}+4b}{b^{2}-4b-32} by multiplying \frac{b^{2}-11b+28}{b^{2}-12b+32} by the reciprocal of \frac{b^{2}+4b}{b^{2}-4b-32}.
\frac{\left(b-8\right)\left(b-7\right)\left(b-4\right)\left(b+4\right)}{b\left(b-8\right)\left(b-4\right)\left(b+4\right)}
Factor the expressions that are not already factored.
\frac{b-7}{b}
Cancel out \left(b-8\right)\left(b-4\right)\left(b+4\right) in both numerator and denominator.