The determinant of a 3x3 matrix can be calculated as follows:
$$
\begin{vmatrix}
a & b & c \\
d & e & f \\
g & h & i
\end{vmatrix}
= aei + bfg + cdh - ceg - bdi - afh
$$
So, for our matrix, we have:
$$
\begin{vmatrix}
x & 2 & 3 \\
1 & x & 0 \\
6 & 1 &
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