Question 42569
{{{500x = (x - 5)(5x + 500)}}}
{{{500x = 5x^2 - 25x + 500x - 2500}}}
{{{0 = 5x^2 - 25x - 2500}}}
{{{0 = x^2 - 5x - 500}}}
{{{0 = (x - 25)(x + 20)}}}
{{{x = 25}}} or {{{x = -20}}}