Example

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

Question

$$\frac{-12}{5}-\frac{7}{20}+\frac{3}{14}+\frac{1}{7}-\frac{1}{10}$$

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