-2\cdot
\begin{vmatrix}
6&8&6&0&2 \\
0&x&3&x&5 \\
0&0&0&5&3 \\
0&5&4&0&2 \\
x&x&x&5&1 \\
\end{vmatrix}
+x\cdot
\begin{vmatrix}
6&0&8&6&2 \\
0&0&x&3&5 \\
0&0&0&0&3 \\
0&6&5&4&2 \\
x&8&x&x&1 \\
\end{vmatrix}
=
-2\cdot
(-5\cdot
\begin{vmatrix}
6&8&6&2 \\
0&x&3&5 \\
0&5&4&2 \\
x&x&x&1 \\
\end{vmatrix}
+3\cdot
\begin{vmatrix}
6&8&6&0 \\
0&x&3&x \\
0&5&4&0 \\
x&x&x&5 \\
\end{vmatrix}
)+x\cdot
(3\cdot
\begin{vmatrix}
6&0&8&6 \\
0&0&x&3 \\
0&6&5&4 \\
x&8&x&x \\
\end{vmatrix}
)=
-2\cdot
(-5\cdot
(x\cdot
\begin{vmatrix}
6&6&2 \\
0&4&2 \\
x&x&1 \\
\end{vmatrix}
-3\cdot
\begin{vmatrix}
6&8&2 \\
0&5&2 \\
x&x&1 \\
\end{vmatrix}
+5\cdot
\begin{vmatrix}
6&8&6 \\
0&5&4 \\
x&x&x \\
\end{vmatrix}
)+3\cdot
(-5\cdot
\begin{vmatrix}
6&6&0 \\
0&3&x \\
x&x&5 \\
\end{vmatrix}
+4\cdot
\begin{vmatrix}
6&8&0 \\
0&x&x \\
x&x&5 \\
\end{vmatrix}
))+x\cdot
(3\cdot
(-x\cdot
\begin{vmatrix}
6&0&6 \\
0&6&4 \\
x&8&x \\
\end{vmatrix}
+3\cdot
\begin{vmatrix}
6&0&8 \\
0&6&5 \\
x&8&x \\
\end{vmatrix}
))=
-2\cdot
(-5\cdot
(x\cdot
(4\cdot
\begin{vmatrix}
6&2 \\
x&1 \\
\end{vmatrix}
-2\cdot
\begin{vmatrix}
6&6 \\
x&x \\
\end{vmatrix}
)-3\cdot
(5\cdot
\begin{vmatrix}
6&2 \\
x&1 \\
\end{vmatrix}
-2\cdot
\begin{vmatrix}
6&8 \\
x&x \\
\end{vmatrix}
)+5\cdot
(5\cdot
\begin{vmatrix}
6&6 \\
x&x \\
\end{vmatrix}
-4\cdot
\begin{vmatrix}
6&8 \\
x&x \\
\end{vmatrix}
))+3\cdot
(-5\cdot
(6\cdot
\begin{vmatrix}
3&x \\
x&5 \\
\end{vmatrix}
-6\cdot
\begin{vmatrix}
0&x \\
x&5 \\
\end{vmatrix}
)+4\cdot
(6\cdot
\begin{vmatrix}
x&x \\
x&5 \\
\end{vmatrix}
-8\cdot
\begin{vmatrix}
0&x \\
x&5 \\
\end{vmatrix}
)))+x\cdot
(3\cdot
(-x\cdot
(6\cdot
\begin{vmatrix}
6&4 \\
8&x \\
\end{vmatrix}
+6\cdot
\begin{vmatrix}
0&6 \\
x&8 \\
\end{vmatrix}
)+3\cdot
(6\cdot
\begin{vmatrix}
6&5 \\
8&x \\
\end{vmatrix}
+8\cdot
\begin{vmatrix}
0&6 \\
x&8 \\
\end{vmatrix}
)))=
-2\cdot
(-5\cdot
(x\cdot
(4\cdot
(6\cdot
1 -2\cdot
x )-2\cdot
(6\cdot
x -6\cdot
x ))-3\cdot
(5\cdot
(6\cdot
1 -2\cdot
x )-2\cdot
(6\cdot
x -8\cdot
x ))+5\cdot
(5\cdot
(6\cdot
x -6\cdot
x )-4\cdot
(6\cdot
x -8\cdot
x )))+3\cdot
(-5\cdot
(6\cdot
(3\cdot
5 -x\cdot
x )-6\cdot
(-x\cdot
x ))+4\cdot
(6\cdot
(x\cdot
5 -x\cdot
x )-8\cdot
(-x\cdot
x ))))+x\cdot
(3\cdot
(-x\cdot
(6\cdot
(6\cdot
x -4\cdot
8 )+6\cdot
(-6\cdot
x ))+3\cdot
(6\cdot
(6\cdot
x -5\cdot
8 )+8\cdot
(-6\cdot
x ))))=