#### Answer

$x = 0, 5$

#### Work Step by Step

In order to solve this problem, we first factor, and then we set each factor equal to 0 to solve:
$4x^{2} = 20x$
$4x^{2} - 20x = 0$
$4x(x - 5) = 0$
Set each factor equal to 0 to solve:
$x = 0 $
$x-5=0 \\\\ x=5$