Tammy sold t-shirts at a festival and made a profit of $51. She made $3 for each t-shirt she sold. Her total expenses were $27. How many t-shirts did she sell?
(a) Write an equation that could be used to answer the question above.
First, choose the appropriate form. Then, fill in the blanks with the
numbers 51, 3, and 27. Let x represent the number of t-shirts.

(b) Solve the equation in part (a) to find the number of t-shirts.