Answer
$x \lt 5$
Refer to the image below for the graph.
Work Step by Step
Divide $4$ on both sides of the inequality to obtain:
$\frac{4x}{4} \lt \frac{20}{4}
\\x \lt 5$
To graph this inequality, plot a hole (or hollow dot) at $x=5$, then shade the region to the left of $5$.
(refer to the attached image in the answer part for the graph)