$$\frac { x ^ { 3 } + y ^ { 3 } } { x ^ { 2 } - x y + y ^ { 2 } } - \frac { x ^ { 3 } - y ^ { 3 } } { x ^ { 2 } + x y + y ^ { 2 } }$$
$2y$
$$\frac{\left(x+y\right)\left(x^{2}-xy+y^{2}\right)}{x^{2}-xy+y^{2}}-\frac{x^{3}-y^{3}}{x^{2}+xy+y^{2}}$$
$$x+y-\frac{x^{3}-y^{3}}{x^{2}+xy+y^{2}}$$
$$x+y-\frac{\left(x-y\right)\left(x^{2}+xy+y^{2}\right)}{x^{2}+xy+y^{2}}$$
$$x+y-\left(x-y\right)$$
$$x+y-x+y$$
$$y+y$$
$$2y$$
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