How do you solve $p - 13 = 20$ ?

Hint:To solve this question, we need to use the concept of addition or subtraction in simple equations. This is typically when the variable is already on one side of the equation, but there is another term which is added to or subtracted from the variable. For instance, we have one variable here $p$ and the digit 13 is subtracted from variable $p$ on the left hand side of the equation. We need to remove this constant term from the left hand side to find the solution of this equation.

Complete step by step answer:
We are given $p - 13 = 20$. Now, to find the variable $p$, we need to remove the digit 13 which is subtracted from it. This can be done by adding 13 to the left hand side. However, it is important to know that we need to perform any arithmetic operation on both the sides of the equation. Therefore, we will add 13 to both the sides of the equation.
$ \Rightarrow p - 13 + 13 = 20 + 13$
We know that the sum of two equal and opposite numbers is zero. Hence, $ - 13 + 13 = 0$. And by adding 20 and 13, we get 33. Putting all these values, we get
$\Rightarrow p + 0 = 33 \\
\therefore p = 33 $
Therefore, our final answer is 33.

Note:It is important to keep in mind that while solving a simple equation, we need to think of the equation as a balance. Thus, if we do something to one side of the equation, we must do the same thing to the other side. Doing the same thing to both sides of the equation keeps the equation balanced. For example, we have added 13 to both the sides of the equation in this problem.