Example

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

Question

$$\frac{9}{7}\times\frac{9}{8}+\frac{4}{5}-(-\frac{9}{3}\div\frac{3}{5})$$

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