Answer
$(3,\infty)$.
See the figure below.
Work Step by Step
By adding $7$ to both sides we get $$ 3x-7\gt 2 \Longrightarrow3x-7+7\gt 2+7\Longrightarrow 3x\gt 9 .$$
Now, by dividing both sides by $3$, we have $x\gt 3$.
In terms of intervals, $x\in (3,\infty)$.
To graph, plot a circle at $x=3$ then shade the region to its right.
See the graph below.
