The number line described has an open point plotted at -3, which indicates that -3 is not included in the solution set. The solid line extending left from -3 means that all values less than -3 are included.
Similarly, there is an open point at 3, indicating that 3 is not included in the solution set, and the solid line extending to the right means that all values greater than 3 are included.
Therefore, the correct interpretation of the number line is that the solution set is:
x < -3 or x > 3
This corresponds to the third option:
x<−3 or x>3
So, the answer is: x < −3 or x > 3.