Unique:
> Start with “x = y”
> Multiply both sides by x: “x² = xy”
> Subtract “y²” from both sides: “”x² – y² = xy – y²”
> Factor: “(x+y)(x-y) = y(x-y)”
> Divide both sides by the common factor “x-y”: “x + y = y”
> Since x=y, we can substitute y for x: “y + y = y”
> Simplify: “2y=y”
> Divide both sides by y: “2 = 1″
from: here
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