Example

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

Question

$$\cdot\frac{1}{2}\div[\frac{-1}{3}\div\frac{2}{5}]=[\frac{1}{2}\div(\frac{-1}{3})]\div\frac{2}{5}$$

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