\[6p^{2} - p - 7 = 6(p + 1)\left( p - \frac{7}{6} \right)\]
\[D = 1 + 168 = 169\]
\[p_{1} = \frac{1 + 13}{12} = \frac{14}{12} = \frac{7}{6};\]
\[p_{2} = \frac{1 - 13}{12} = - 1.\]