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Three liquids are at temperatures of 4?C, 21?C, and 31?C, respectively. Equal masses of the first two liquids are mixed, and the equi- librium temperature is 15?C. Equal masses of the second and third are then mixed, and the equilibrium temperature is 28.9?C. Find the equilibrium temperature when equal masses of the first and third are mixed.
Answer in units of ?C
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