If \( A=\left[\begin{array}{ccc}1 & 2 & x \\ 3 & -1 &am...

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If \( A=\left[\begin{array}{ccc}1 & 2 & x \\ 3 & -1 & 2\end{array}\right] \) and \( B=\left[\begin{array}{l}y \\ x \\ 1\end{array}\right] \) be such that \( A B=\left[\begin{array}{l}6 \\ 8\end{array}\right] \), then:
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