#### Answer

$\left\{\right\}$

#### Work Step by Step

Distribute $3$ (on the right side of the equation):
$3x-7 = 3x+3$
Solve the equation to obtain:
$3x-3x=3+7
\\0=10$
This is a false statement. Thus, the given equation has no solution.
The solution set is $\left\{\right\}$.