A rectangular garden sits next to a house. There is fencing on three sides of the
garden and the fourth side is the house. There is a total of 21.5 meters of fencing
around the garden. The length of the garden along the house is 9 meters. Which
equation can be used to find the width, w, of the garden in meters?

A. 2w+9=21.5
B. 2w+18=21.5
C. 2w-21.5=9
D. 2w+21.5=9