Factor
\frac{5\left(39b^{3}-7\right)b^{m}}{42}
Evaluate
\frac{65b^{m+3}}{14}-\frac{5b^{m}}{6}
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\frac{6b^{m+3}-28b^{m}-21b^{m+3}-7\left(b^{m}-30b^{m+3}\right)}{42}
Factor out \frac{1}{42}.
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