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A 3.9 meter long plank of negligible mass has a 30 kg mass at one end of the plank and a 38 kg mass at

A 3.9 meter long plank of negligible mass has a 30 kg mass at one end of the plank and a 38 kg mass at the other end. How far from the 30 mass should a fulcrum be placed so the plank is balanced?

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