Example

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

Question

$$-20+(\frac{3}{-5}+\frac{-7}{-10})=(-20+\frac{3}{-5})+\frac{-7}{-10}$$

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