Example

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

Question

$$[\begin{matrix}1&2\\ 3&5\end{matrix}]+[\begin{matrix}2&5\\ 7&9\end{matrix}].$$

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