Example

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

Question

$$\begin{cases}-x_{1}+3x_{2}=4\\ 3x_{1}-2x_{2}+x_{3}=-3\\ 2x_{1}+x_{2}-x_{3}=-3\end{cases}$$

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