Example

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

Question

$$2^{-1}[(\frac{5}{4})^{4}+(\frac{3}{5})^{-2}]\div\frac{17}{9}$$

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