Apparently he figured out the impossible, at least there's no dividing by zero.
Alright, center of a smudge. See, what you gotta do first, you gotta find the disproportional weight properties of a smudge, y'know what I'm sayin, but man, thats easy. Throw some quadratic equations, y'know, some inequalities in there. Give yourself some cross hairs and whatnot, and y'know what? Divide it by 3.5, add it up, divide it one more time by 2, there you go. Center of a smudge.