\[3x² - 24x = 0\]
\[3x(x - 8) = 0\]
\[x = 0,\ \ x - 8 = 0\]
\[\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x = 8\]
\[Ответ:x = 0;x = 8.\]