If $\begin{bmatrix} 1 & x & 2 \end{bmatrix} \begin{bmatrix} 2 & 3 & 1 \ 0 & 4 & 2 \ 0 & 3 & 2 \end{bmatrix} \begin{bmatrix} x \ 1 \ -1 \end{bmatrix} = O$, then the value of x is :-
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