For what value of x the matrix `A=[[1,-2,3],[1,2,1],[x,2,-3]]` is singular?

Explanation

To determine the value of \( x \) for which the matrix

\[
A = \begin{bmatrix}
1 & -2 & 3 \\
1 & 2 & 1 \\
x & 2 & -3
\end{bmatrix}
...