\[\frac{(a + 2)(x - a)}{x - 9} = 0;\ \ \ \ x \neq 9\]
\[(a + 2)(x - a) = 0\]
\[\ x = a.\]
\[a = - 2 \Longrightarrow x - любое.\]
\[a = 9 \Longrightarrow нет\ решения.\]
\[a \neq - 2;\ \ a \neq 9 \Longrightarrow x = a.\]