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An artist working on a piece of metal in his forging studio plunges the hot metal into oil in order to harden it. The metal piece has a mass of 66 kg and its specific heat is 429.7 J/(kg · K). He uses 810 kg of oil at 35°C. The specific heat of oil is 2999 J/(kg · K). Once the metal is immersed in the oil, the temperature reaches an equilibrium value of 39°C. How hot was the forged metal piece just before he plunged it into the oil?

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