Answer
$[4, +\infty)$
Refer to the image below for the graph.
Work Step by Step
Divide by $2$ on both sides to obtain:
$x \ge 4$
The solution set is the set of real numbers greater than or equal to $4$.
In interval notation, the solution set is:
$[4, +\infty)$
To graph this inequality, plot a solid dot at $x=4$ then shade the region to its right.
(refer to the attached image in the answer part)