The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -0.0667\\[1 em]x_2 &= 0.0329+0.0584i\\[1 em]x_3 &= 0.0329-0.0584i\\[1 em]x_4 &= -4.4172+4.5326i\\[1 em]x_5 &= -4.4172-4.5326i\\[1 em]x_6 &= 4.5843+4.538i\\[1 em]x_7 &= 4.5843-4.538i \end{aligned} $$Polynomial $ 6x^7-2x^6+4x^5+2x^4+10000x^3+9x^2+x+3 $ has no rational roots that can be found using Rational Root Test, so the roots were found using Newton method.