Tom, Dick, and Harry weigh 50, 85, 120 lbs. respectively and use a 12ft plank for a teeterboard. Tom sits 5ft, Dick sits 4 ft, and Harry sits 3 ft from the fulcrum on the same side. The fulcrum is at the midpoint of the board. How far must a 200-lbs friend sit from the fulcrum to balance them?

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