Example

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

Question

$$[\begin{matrix}3&8\\ 4&6\end{matrix}]-[\begin{matrix}4&0\\ 1&-9\end{matrix}]=$$

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