Consider the matrix

$$A = \left[ \begin{array}{ccc} -6 - x & 726 & -15 \pi \\ 0 & -5 - x & 6\\ 0 & 1 & 0 - x \end{array} \right]$$

and let $B$ be a matrix similar to $A$, i.e., $B$ is of the form $S^{-1} A S$ for some nonsingular matrix $S$. Find all possible values of $x$ so that $\det( B) = 0$. Separate multiple values by a comma.

Answer: