#### Answer

{15}.

#### Work Step by Step

$\frac{x}{5}$ = 3
Step 1: Multiply both the sides by 5
$\frac{x}{5}$ x 5 = 3x5
Step 2: Simplify
x= 15
Now we check the proposed solution, 15, by replacing x with 15 in the original equation.
Step 1: the original equation $\frac{x}{5}$ = 3
Step2: Substitute 15 for x
$\frac{15}{5}$ = 3
Step 3: Solve $\frac{15}{5}$ =3
3=3
Since the check results in true statement, we conclude that the solution set of the given equation is {15}.