\[ax > 9x + 6\]
\[ax - 9x > 6\]
\[(a - 9)x > 6\]
\[x > \frac{6}{a - 9}\]
\[Нет\ решения\ \]
\[при\ a - 9 = 0 \Longrightarrow a = 9.\]
\[Ответ:\ \ при\ a = 9.\]