x = yMultiplying each side by x

xSubtracting y^{2}= xy

xFactoring each side^{2}- y^{2}= xy - y^{2}

(x + y)(x - y) = y (x - y)Dividing out the common term ((x - y) we have

x + y = ySubstituting the given values

1 + 1 = 1Or

2 = 1What is wrong with this proof?

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