1. The problem states: If $23p = 390$, find $p$. 2. The formula to solve for $p$ is to isolate $p$ by dividing both sides of the equation by 23. 3. Divide both sides by 23: $$p = \frac{390}{23}$$ 4. Calculate the division: $$p = 17$$ 5. Therefore, the value of $p$ is 17.