$$\frac{ 2 }{ 5 } { x }^{ 2 } (10-15x-5 { x }^{ 2 }$$
$2x^{2}\left(2-3x-x^{2}\right)$
$$4x^{2}-6x^{3}-2x^{4}$$
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$4x^{2}-6x^{3}-2x^{4}$
