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The person before made a mistake in their proof. 1. x = y 2. xy = y^2 3. xy - x^2 = y^2 - x^2 4. x(y - x) = (y + x)(y - x) So far so good. 4.5. x = (y + x)(y - x)/(y - x)] is what they did to get to step 5, which says: 5. x = y + x This is wrong though. since x = y, y -x = 0, and so you can't divide by y - x.
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