Example

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

Question

$$\frac{2}{5}+(-\frac{4}{3}+\frac{8}{9})=(\frac{2+\frac{-4}{3})8}{9}$$

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