In order to solve $ \color{blue}{ 5000x^{2}+150x = 0 } $, first we need to factor our $ x $.
$$ 5000x^{2}+150x = x \left( 5000x+150 \right) $$$ x = 0 $ is a root of multiplicity $ 1 $.
The second root can be found by solving equation $ 5000x+150 = 0$.