\[\sqrt{x^{2}} = x + 3\]
\[|x| = x + 3\]
\[x = - (x + 3)\ \ \ \ \ \ \ \ \ \ \ \ x = x + 3\]
\[x = - x - 3\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x - x = 3\]
\[x + x = - 3\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 0 = 3\]
\[2x = - 3\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ нет\ решения\]
\[x = - 1,5.\]
\[Ответ:\ x = - 1,5.\]