If $\left|\begin{array}{cc}x & 2 \\ 18 & x\end{array}\right|=\left|\begin{array}{cc}6 & 2 \\ 18 & 6\end{array}\right|,$ then $x$ is equal to

  • A
    $6$
  • B
    $\pm 6$
  • C
    $-6$
  • D
    $0$

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