\[По\ теореме\ Виета:\]
\[x_{1} + x_{2} = - b;\ \ \ \ \]
\[x_{1} \cdot x_{2} = c.\]
\[x_{1} = \frac{2}{3};\ \ x_{2} = 5:\]
\[x_{1} + x_{2} = 5\frac{2}{3} = \frac{17}{3};\]
\[x_{1} \cdot x_{2} = \frac{10}{3}.\]
\[x^{2} - \frac{17}{3}x + \frac{10}{3} = 0\ \ \ \ \ | \cdot 3\]
\[\Longrightarrow 3x² - 17x + 10 = 0.\]