Example

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

Question

$$\frac{-2}{3}-[\frac{-4}{5}-\frac{1}{2}]=[\frac{2}{3}-(\frac{-4}{5})]-\frac{1}{2}?$$

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