In order to solve $ \color{blue}{ -5x^{6}+2x = 0 } $, first we need to factor our $ x $.
$$ -5x^{6}+2x = x \left( -5x^{5}+2 \right) $$$ x = 0 $ is a root of multiplicity $ 1 $.
The remaining roots can be found by solving equation $ -5x^{5}+2 = 0$.
This polynomial has no rational roots that can be found using Rational Root Test.
Roots were found using Newton method.