Answer
$\{x|x\text{ is a multiple of $3$}\}$
Work Step by Step
In set-builder notation, the given set, $\{
...,-6,-3,0,3,6,...
\}$ can be described as
\begin{array}{l}\require{cancel}
\{x|x\text{ is a multiple of $3$}\}
.\end{array}
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