Answer
$x=4$
Work Step by Step
A rational expression is undefined when the value of its denominator is zero. Write and solve an expression where the denominator is zero.
$5x-20=0$
Add 20 to both sides.
$5x-20+20=0+20$
Simplify.
$5x=20$
Divide both sides by 5.
$5x\div5=20\div5$
Simplify.
$x=4$
