Example

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

Question

$$\frac{-2}{7}+[\frac{3}{7}+\frac{-5}{9}]=[\frac{-2}{7}+\frac{3}{7}]+\frac{-5}{9}$$

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