Whats the answer?

The total cost of anja’s trip to the dentist was $628.35. she paid a flat fee of $89.95 which included the checkup and cleaning and then had 4 cavities filled, each of which cost the same amount. which shows the correct equation and value of x, the cost of each cavity filling?

What multiplys to be 1 but adds up to be 4

How do newtons third law of motion demonstrates on a rollar coster