Example

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

Question

$$\frac{1}{2}+\frac{3}{10}\div\frac{3}{5}-\frac{1}{3}\times\frac{5}{2}$$

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