If the matrix \( A=\left[\begin{array}{rrr}1 & -2 & 3 \\ 1 & 2 & 1 \\ x & 2 & -3\end{array}\righ...
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If the matrix \( A=\left[\begin{array}{rrr}1 & -2 & 3 \\ 1 & 2 & 1 \\ x & 2 & -3\end{array}\right] \) is singular, find \( x \).
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