Example

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

Question

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

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