Example

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

Question

$$(\frac{-8}{13})^{-1}+(\frac{14}{5})^{-1}\}\div(\frac{7}{5})^{-1}$$

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