The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 2.4392\\[1 em]x_2 &= -0.9696+0.5384i\\[1 em]x_3 &= -0.9696-0.5384i \end{aligned} $$Polynomial $ 2x^3-x^2-7x-6 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.