Example

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

Question

$$\{9\div(\frac{3}{10}-\frac{2}{10}+\frac{1}{5})\}\times3+\frac{1}{5}$$

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