$$\frac{ - { x }^{ 2 } + { y }^{ 2 } }{ y-x }$$
$x+y$
$$\frac{\left(x-y\right)\left(-x-y\right)}{-x+y}$$
$$\frac{-\left(-x+y\right)\left(-x-y\right)}{-x+y}$$
$$-\left(-x-y\right)$$
$$x+y$$
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