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\frac{3^{-5}}{3^{-9}}
To multiply powers of the same base, add their exponents. Add -7 and 2 to get -5.
3^{4}
To divide powers of the same base, subtract the denominator's exponent from the numerator's exponent. Subtract -9 from -5 to get 4.
81
Calculate 3 to the power of 4 and get 81.