\[9x^{2} - 3x = 0\]
\[3x(3x - 1) = 0\]
\[1)\ 3x = 0\]
\[x = 0.\ \ \ \ \ \ \ \ \ \]
\[2)\ 3x - 1 = 0\]
\[3x = 1\]
\[\ x = \frac{1}{3}.\]
\[Ответ:x = 0;x = \frac{1}{3}.\]