Example

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

Question

$$\left[\begin{matrix} 1 & -1 & 2 \\2 & a & -1 \\3 & -2 & 2 \end{matrix}\right]$$

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