\[x^{2} - 5x + 6 = 0\]
\[x_{1} + x_{2} = 5\]
\[x_{1} \cdot x_{2} = 6\]
\[\Longrightarrow x_{1} = 3,\ \ x_{2} = 2.\]
\[При\ a = x \Longrightarrow нет\ решения.\]
\[При\ a \neq x \Longrightarrow x_{1} = 3,\ x_{2} = 2.\]