Cat O'Falk, on 25 September 2014 - 10:58 AM, said:

Multiply both sides by x to give x^2 = xy

Subtract y^2 from both sides to give x^2-y^2 = xy- y^2

Factorize to give (x+y) (x-y) = y(x-y)

Divide both sides by (x-y) to give x+y = y

As x = y substitute x for y to give x+x = x

Divide both sides by x to give two = one

I think your keyboard is broken.