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Alright, it looks like the math geek must strike again.
Any two digit number can be represented by 10x + y.
When you pick a two digit number and then subtract the sum, you get the following:
(10x + y) - (x + y)
Expanding you get:
10x + y - x - y
And finally:
9x
So, your answer will be the first digit of the number you picked multiplied by nine, regardless of what your second number was.
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