$$(3x5- { x }^{ 2 } +7 { x }^{ 3 } -4+2x) \times -2=$$
$2\left(4-3x_{5}-2x+x^{2}-7x^{3}\right)$
$$-6x_{5}+2x^{2}-14x^{3}+8-4x$$
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$8-6x_{5}-4x+2x^{2}-14x^{3}$
