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-\frac{7}{b+10}
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-\frac{7}{b+10}
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\frac{7\left(-b+4\right)}{b-4}\times \frac{1}{b+10}
Factor the expressions that are not already factored in \frac{28-7b}{b-4}.
\frac{-7\left(b-4\right)}{b-4}\times \frac{1}{b+10}
Extract the negative sign in 4-b.
-7\times \frac{1}{b+10}
Cancel out b-4 in both numerator and denominator.
\frac{-7}{b+10}
Express -7\times \frac{1}{b+10} as a single fraction.
\frac{7\left(-b+4\right)}{b-4}\times \frac{1}{b+10}
Factor the expressions that are not already factored in \frac{28-7b}{b-4}.
\frac{-7\left(b-4\right)}{b-4}\times \frac{1}{b+10}
Extract the negative sign in 4-b.
-7\times \frac{1}{b+10}
Cancel out b-4 in both numerator and denominator.
\frac{-7}{b+10}
Express -7\times \frac{1}{b+10} as a single fraction.
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Limits
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