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Help me see how to do a math problem in Grade Two ()13 24 36 43 54 45 4718 30 ()
(7) 13 24 36 43 54 45 47 18 30 (37)

With 54 as the center, the left side is 54-43= 1 1, 54-45=9, 54-47=7, 45-47=-2, and the sum of the two sides is 1 1, so the left side is not 54-.

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