I will tell you the number you get at the end of this problem.
Write a three-digit number (with three different digits).
Mix up the digits to get another three-digit number.
Subtract the smaller number from the larger.
Add the digits in the difference. (If you get a two-digit answer, add the two digits to get a single digit.)
Subtract 5 to get a final number.
Your answer is 412.
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