The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -0.059\\[1 em]x_2 &= -0.5885\\[1 em]x_3 &= -0.2325+0.7829i\\[1 em]x_4 &= -0.2325-0.7829i\\[1 em]x_5 &= 0.6991+0.735i\\[1 em]x_6 &= 0.6991-0.735i \end{aligned} $$Polynomial $ 42x^6-12x^5+20x^4+8x^3+18x^2+18x+1 $ has no rational roots that can be found using Rational Root Test, so the roots were found using Newton method.