This question has two parts. First, answer Part A. Then, answer Part B. Part A
Jasmine started a dog walking business in her community. She offers a basic walk service and a deluxe service that includes a trip to the dog park. The expressions in the table represent the number of each type of service she sold over a period of w weeks.

Service Cost ($) Number Sold
Basic Walk 3 7(w + 3)
Deluxe Walk 8 3w + 5

Write an expression that represents the difference between the number of basic walks and deluxe walks sold. Write your answer in factored form.