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