\[- 4 < \frac{9a + 5}{6} < 3\]
\[- 24 < 9a + 5 < 18\]
\[- 29 < 9a < 13\]
\[- \frac{29}{9} < a < \frac{13}{9}.\]
\[Ответ:\left( - \frac{29}{9};\frac{13}{9} \right).\]