To find the number of visits (x) per month where the costs of the two plans are equal, we need to set up equations based on the given information.
- The cost of the first plan (pay-per-visit) is \( 20x \) (where \( x \) is the number of visits).
- The cost of the second plan (monthly fee plus pay-per-visit) is \( 45 + 5x \).
We want to find \( x \) such that the costs are equal:
\[ 20x = 45 + 5x \]
So the correct equation is:
20x = 45 + 5x