$$-3 { x }^{ 3 } +5x-9x+15 { x }^{ 5 } +6x+4 { x }^{ 5 }$$
$x\left(19x^{4}-3x^{2}+2\right)$
$$-3x^{3}-4x+15x^{5}+6x+4x^{5}$$
$$-3x^{3}+2x+15x^{5}+4x^{5}$$
$$-3x^{3}+2x+19x^{5}$$
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$$x\left(-3x^{2}+2+19x^{4}\right)$$
