To solve the equation
\[ \frac{g - 3}{5} = 3, \]
you can follow these steps:
- Multiply both sides of the equation by 5 to eliminate the fraction:
\[ g - 3 = 15. \]
- Next, add 3 to both sides:
\[ g = 15 + 3, \]
which simplifies to:
\[ g = 18. \]
Thus, the solution is
\[ g = 18. \]