$$\frac { y ^ { 2 } - x ^ { 2 } } { 2 x y } : \frac { x + y } { 2 y }$$
$\frac{y}{x}-1$
$$\frac{\left(y^{2}-x^{2}\right)\times 2y}{2xy\left(x+y\right)}$$
$$\frac{-x^{2}+y^{2}}{x\left(x+y\right)}$$
$$\frac{\left(x+y\right)\left(-x+y\right)}{x\left(x+y\right)}$$
$$\frac{-x+y}{x}$$
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