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