Example

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

Question

$$(3\frac{3}{10}+\frac{7}{20})\cdot(\frac{3}{4}+5\frac{19}{20})$$

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