Example

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

Question

$$[\frac{-5}{10}+\frac{10}{20}]+\frac{15}{30}\cdot\frac{-5}{10}+[\frac{10}{20}\cdot\frac{16}{310}]$$

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