\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Write the augmented matrix \((A \mid B)\) of the system \(\{3 x + 2 y - z = 1 \;;\; x - y + 4 z = 0 \;;\; 5 x + y + 2 z = 7\}\). Indicate which columns belong to \(A\) and which is \(B\).
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