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2^{8}\times 2^{7}\times 2^{-18}
To multiply powers of the same base, add their exponents. Add 3 and 5 to get 8.
2^{15}\times 2^{-18}
To multiply powers of the same base, add their exponents. Add 8 and 7 to get 15.
2^{-3}
To multiply powers of the same base, add their exponents. Add 15 and -18 to get -3.
\frac{1}{8}
Calculate 2 to the power of -3 and get \frac{1}{8}.