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