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Question

In the expression \(\begin{bmatrix} 1 & 2 \\ -1 & 0 \\ 3 & 1\end{bmatrix} \begin{bmatrix} -2 & 1 \\ 0 & 1\end{bmatrix} = \begin{bmatrix} -2 & 3 \\ x & -1 \\ -6 & 4 \\ \end{bmatrix}\). What is \(x\)?