There are three ways to write the solution set of an inequality.

First we solve the inequality for x 



That's the solution.  Here are the three ways to indicate
the solution set which is the set of all numbers which
we can substitute for x and the solution inequality will be true.

1. The set-builder notation for the solution set is:



2. The graphical notation for this solution set is



3. The interval notation for this solution set is:



Edwin