\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Write in matrix form the \(2 \times 3\) system \(\{x + 2y - z = 5 \;;\; 3x - y + 4z = 0\}\) of unknowns \((x, y, z) \in \mathbb{R}^3\). State the sizes of \(A\), \(X\), \(B\).
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