\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Recover the linear system encoded by the augmented matrix $$ (A \mid B) = \left( \begin{array}{ccc|c} 1 & 0 & -2 & 3 \\ 4 & 1 & 0 & -1 \end{array} \right). $$
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