Example

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

Question

$$2\times1+1\times\frac{1}{10}+5\times\frac{1}{100}+\boxed{\times}\frac{1}{1000}$$

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