Example

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

Question

$$\begin{aligned}0\ 2\ 7&\\ +1\ 2\ 0&\\ 9\ 8\ 5\ 5&\end{aligned}$$

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