The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 1.6693\\[1 em]x_2 &= -0.6347+0.5622i\\[1 em]x_3 &= -0.6347-0.5622i \end{aligned} $$Polynomial $ 5x^3-2x^2-7x-6 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.