\[7y^{2} + 19y - 6 =\]
\[= 7(x + 3)\left( x - \frac{2}{7} \right) =\]
\[= (x + 3)(7x - 2).\]
\[D = 361 + 168 = 529 = 23^{2}\]
\[x_{1} = \frac{- 19 + 23}{14} = \frac{4}{14} = \frac{2}{7};\ \]
\[x_{2} = \frac{- 19 - 23}{14} = - \frac{42}{14} = - 3.\]