Write a system of equations to describe the situation below, solve using any method, and fill in the blanks.
Mrs. Hickman is researching what it would cost to order flower arrangements for a fancy party. She wants one large centerpiece for the head table, and smaller arrangements for the smaller tables. Hillsboro Florist charges $13 for each smaller arrangement, plus $29 for the large centerpiece. Doug's Flowers, in contrast, charges $43 for the large centerpiece and $12 per arrangement for the rest. If Mrs. Hickman orders a certain number of small arrangements, the cost will be the same at either flower shop. What would the total cost be? How many small arrangements would that be?
The cost will be $ ____ if Mrs. Hickman orders _____ of the small arrangements.