Example

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

Question

$$\frac{2}{2}+\frac{1}{3}-\frac{1}{2}-\frac{4}{5}\div\frac{1}{2}$$

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