Question: Choose 3 different numbers whose digits are decreasing , then reverse the 3 digit number and subtract it from the original . DO NOT USE

Choose 3 different numbers whose digits are decreasing, then reverse the 3 digit number and subtract it from the original. DO NOT USE A CALCULATOR. (396-693). Then take the answer, reverse it and add it to the first answer. What is the answer? Three times with three different sets of digits. What answer(s) did you get? Attempt to explain this "magic trick" using a little algebra.

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