26 - 13 = 13 - 13 + ? = 26, 57 - 31 = 26 - 26 + 31 = , 37 - 12 = 25 - 25 + ? = 37, 89 - 35 = 54 - ? + 35 = 89, 34 - 24 = 10 - 24 + ? = 34, 44 + 19 = 63 - ? - 19 = 44, 80 + 12 = - 92 - 12 =, 10 + 37 = - 47 - ? = 10, 85 - 35 = 50 - ? + 35 = 85,

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