Sure, let's calculate the sum using the given variables 'p' and 'x'.
Step 1: Combine like terms
Before we add 'p' with 13 and 8, let's first combine 'p' and '4p' because they are similar variables. This will give us '5p'. Now, our equation becomes: 13 + 8 + 5p + x.
Step 2: Add the constants
The equation from step 1 has two constants: 13 and 8. Adding these together gives us 21. So, our equation becomes: 21 + 5p + x.
So, if you want to calculate the exact value, you need to substitute the variables 'p' and 'x' with specific values. The final solution is therefore expressed in terms of 'p' and 'x' as:
21 + 5p + x