\[3x² - 28x + 9 = 0\]
\[x_{1} + x_{2} = \frac{2}{3};\ \ x_{1} \cdot x_{2} = 3\]
\[x_{1} = 9;\ \ \ \ \ \ x_{2} = \frac{1}{3}\]
\[Ответ:x = 9;x = \frac{1}{3}.\]