Answer
$x\gt -7$
The graph is shown below.
Work Step by Step
The given inequality is
$\Rightarrow 3x\gt -21$
Divide each side by $3$.
$\Rightarrow \frac{3x}{3}\gt -\frac{21}{3}$
Simplify.
$\Rightarrow x\gt -7$
Hence, the solution is $x\gt -7$.
