Example

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

Question

$$\frac{4}{9}\div\{\frac{4}{5}\times(\frac{4}{25}-\frac{7}{10})\}+\frac{1}{2}$$

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