26 - 13 = 13 - 13 + ? = 26, 57 - 31 = 26 - 57 - ? = 31, 174 - 112 = 62 - 112 + ? = 174, 89 - 35 = 54 - ? + 35 = 89, 364 - 254 - 254 + ? = 364, 44 + 19 = 63 - ? - 19 = 44,

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