Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$(-\frac{1}{2})^{-3}\times(\frac{1}{2})^{-k}; (\frac{1}{2})^{-5}$$

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