Want to make a dog run. Have 199.4 feet of fencing and the garage is 19.2 feet wide. How long will the run be?
Assuming one side of the run is 19.2, and is formed by the garage wall, then we have
2x+19.2 = 199.4
x = 90.1 ft
That assumes also that the door to the run is contained in the garage wall, and thus no gate is needed in the fencing.