\[y = \frac{4x - 1}{5x^{2} - 13x - 6}\ \]
\[5x^{2} - 13x - 6 \neq 0\]
\[D = 169 + 120 = 289 = 17^{2}\]
\[x_{1} = \frac{13 + 17}{10} = 3;\ \ \ \]
\[x_{2} = \frac{13 - 17}{10} = - 0,4.\ \]
\[Ответ:x \neq 3;\ \ x \neq - 0,4.\ \]