The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -0.269\\[1 em]x_2 &= 0.1345+1.105i\\[1 em]x_3 &= 0.1345-1.105i \end{aligned} $$Polynomial $ 6x^3+7x+2 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.