The wallpaper border that runs all the way around a room is 5f 2 + 19f + 11 long. Three sides

The wallpaper border that runs all the way around a room is 5f 2 + 19f + 11

long. Three sides of the room have the following lengths of border: 6f, 5f − 7,
2f 2 + 2. What is the length of the fourth side of the room?

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