Question

|x - 4| = 20

Explanation:

Step1: Apply absolute value rule

If $|x-a|=b$, then $x-a=b$ or $x-a=-b$

Step2: Solve first equation

$x-4=20$
$x=20+4$
$x=24$

Step3: Solve second equation

$x-4=-20$
$x=-20+4$
$x=-16$

Answer:

$x=24$ or $x=-16$