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\left(\begin{array}{lll} 2 & 0 & 0 \\ 0 & 1 & 3 \\ 0 & 0 & 0 \end{array}\right)\left(\begin{array}{l} x \\ y \\ z \end{array}\right)=\left(\begin{array}{l} 6 \\ 7 \\ 0

\end{array}\right), \quad x=?

Fig: 1