Example

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

Question

$$9^{0}+9^{-1}-9^{-2}+9^{\frac{1}{2}}-9^{-\frac{1}{2}}$$

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