\[\boxed{\text{527\ (527).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[(2x + 3)^{2} = 0\]
\[2x + 3 = 0\]
\[2x = - 3\]
\[x = - \frac{3}{2}\]
\[x = - 1,5\]
\[Ответ:\ \ x = - 1,5.\]