Example

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

Question

$$(\frac{2}{3}+\frac{-4}{5}+\frac{7}{15}+\frac{-11}{20})=?$$

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