Example

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

Question

$$[\begin{matrix}x-y&4\\ 20&x+y\end{matrix}]=[\begin{matrix}6&4\\ 20&8\end{matrix}]$$

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