\[\sqrt{2x + 3} - \frac{1}{\sqrt{9 - 2x}}\]
\[\left\{ \begin{matrix} 2x + 3 \geq 0 \\ 9 - 2x > 0\ \\ \end{matrix}\text{\ \ } \right.\ \text{\ \ \ \ \ }\]
\[\left\{ \begin{matrix} 2x \geq - 3 \\ 2x < 9\ \ \ \\ \end{matrix}\text{\ \ } \right.\ \text{\ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} x \geq - 1,5 \\ x < 4,5\ \ \ \\ \end{matrix} \right.\ \]
\[Ответ:\lbrack - 1,5;\ \ 4,5).\]