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Could one of you geniuses explain to me how this works?

Here we go: No matter what two-digit number you select, when you add the digits and subtract this sum from the two-digit number you started with, the answer will always be a multiple of nine... the result will be either 9, 18, 27, 36, 45, 54, 63, 72, or 81. Look carefully at that shockwave file... ...

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