Example

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

Question

$$\frac{-1}{2}\times\frac{-4}{7}+\frac{3}{14}\times\frac{1}{2}+\frac{7}{2}\times-\frac{1}{2}$$

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