Example

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

Question

$$[(\frac{1}{2})^{-2}-(\frac{1}{2})^{-3}]\div(\frac{1}{3})^{-2}$$

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