The determinant of a 2x2 matrix is calculated as follows:
\[ \left|\begin{array}{ll}
a & b \\
c & d
\end{array}\right| = ad - bc \]
So, for the left matrix, we have:
\[ \left|\begin{array}{ll}
3 & x \\
1 & 2
\end{array}\right| = 3*2 - x*1 = 6 - x \]
And for the
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