Example

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

Question

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

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