Example

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

Question

$$A+[\begin{matrix}-9\\ -8\\ -9\end{matrix}]=[\begin{matrix}-6\\ -11\\ -2\end{matrix}]$$

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