x = y |*x
x^2 = xy | -y^2
x^2-y^2 = xy - y2^ | 3rd binomial formula and factorise
(x+y)*(x-y) = y(x-y) |:(x-y)
x+y = y | insert x=y from first line
2y=y | :y
2=1
therefore 2+2 cant be 4

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