A carpenter is laying out a wood frame wall for the installation of a 3′ x 7′ prehung wood door unit. The center of the door will be 8′ from the outside corner. How far from the corner is the nearest edge of the rough opening?

A carpenter is laying out a wood frame wall for the installation of a 3′ x 7′ prehung wood door unit. The center of the door will be 8′ from the outside corner. How far from the corner is the nearest edge of the rough opening?