Given the following question:
[tex]\begin{gathered} |x|\leq3 \\ |u|\:\le\:a,\:a\:>=-a\:\le\:u\:\le\:a \\ \lvert x\rvert\leq3=-3\le\:x\le\:3 \\ \text{ In interval notation} \\ -3\le\:x\le\:3=\left[-3,\:3\right] \\ =\left[-3,\:3\right] \end{gathered}[/tex]
To graph the solution set:
