Answer
$\left\{0, 1, 2, 3, 4, 6, 8, 10, 12\right\}$
Work Step by Step
$x \in Q$ or $x \in R$ means that the elements of the given set are either in Q or in R. This is actually the definition of the union of the sets Q and R.
Thus, the given set is equivalent to:
$Q \cup R = \left\{0, 1, 2, 3, 4, 6, 8, 10, 12\right\}$
