\[ОДЗ:\ \ 2x + 3 \neq 0;\ \ \ x \neq - 1,5\]
\[3x² + 15x + 18 = 0\ \ |\ :3\]
\[x^{2} + 5x + 6 = 0\]
\[x_{1} + x_{2} = - 5\]
\[x_{1} \cdot x_{2} = 6\]
\[\Longrightarrow x_{1} = - 3,\ \ x_{2} = - 2.\]
\[Ответ:\ x = - 3;\ x = - 2.\]