$$x+2 \div 8 { x }^{ 3 } -5 { x }^{ 2 } -6x+4$$
$\frac{x^{3}}{4}-5x^{2}-5x+4$
$$x+\frac{1}{4}x^{3}-5x^{2}-6x+4$$
$$-5x+\frac{1}{4}x^{3}-5x^{2}+4$$
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$\frac{x^{3}-20x^{2}-20x+16}{4}$
$$\frac{4x+x^{3}-20x^{2}-24x+16}{4}$$
