Example

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

Question

$$\frac{2}{3}\times\frac{3}{4}-\frac{1}{4}\times\frac{1}{2}\div\frac{-4}{5}+\frac{7}{8}$$

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