Answer
Domain: $\{2\}$
Range: $(-\infty,\infty)$
Work Step by Step
First we solve $-3x+6=0$:
$-3x+6=0$
$-3x=-6$
$x=2$
We graph $x=2$ by recognizing that it represents a vertical line through the point $(2,0)$. See graph for result.
Since the graph is a vertical line, we know that the domain is restricted to $2$, while the range is all real numbers:
Domain: $\{2\}$
Range: $(-\infty,\infty)$