To solve the equation \( \frac{18}{3} = \frac{3x}{3} \), we can simplify both sides.
First, simplify the left side:
\[ \frac{18}{3} = 6 \]
Now simplify the right side:
\[ \frac{3x}{3} = x \]
This means the equation simplifies to:
\[ 6 = x \]
Thus, the equation has one solution:
\[ x = 6 \]
In conclusion, there is 1 solution to the equation.