XY YX = x what is x and y XY and YX are two digits, not multipliers

98-89=9
Because XY YX gets a single digit x, it means that X and y must be two adjacent numbers, and x > y, it means that XY can only be one of 10, 21, 32, 43, 54, 65, 76, 87, 98, then we can get x = 9, y = 8

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