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-9
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-9
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\frac{\left(70-10\right)\times 90}{10\left(30-90\right)}
Divide \frac{70-10}{10} by \frac{30-90}{90} by multiplying \frac{70-10}{10} by the reciprocal of \frac{30-90}{90}.
\frac{-90\left(30-90\right)}{10\left(30-90\right)}
Extract the negative sign in 70-10.
-9
Cancel out 10\left(30-90\right) in both numerator and denominator.
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