4. If two augmented matrices \( (\mathbf{A}|\mathbf{b}) \) and \( (\mathbf{B}|\mathbf{c}) \) are row equivalent, then the determinants of \( \mathbf{A} \) and \( \mathbf{B} \) are equal.
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4. If two augmented matrices \( (\mathbf{A}|\mathbf{b}) \) and \( (\mathbf{B}|\mathbf{c}) \) are row equivalent, then the determinants of \( \mathbf{A} \) and \( \mathbf{B} \) are equal.