$$y-1 \div 2 { y }^{ 3 } + { y }^{ 2 } -2y-1$$
$-\frac{y^{3}}{2}+y^{2}-y-1$
$$-y-\frac{1}{2}y^{3}+y^{2}-1$$
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$\frac{-y^{3}+2y^{2}-2y-2}{2}$
$$\frac{2y-y^{3}+2y^{2}-4y-2}{2}$$
