Example

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

Question

$$\{\frac{1}{3}+(\frac{3}{4}-\frac{5}{6})\}+\{\frac{1}{5}-(\frac{1}{6}-\frac{1}{2})\}$$

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