$$\frac{ 2 { x }^{ 3 } +2x+ { x }^{ 2 } -1 }{ (x-1)( { x }^{ 2 } +x+1) }$$
$\frac{2x^{3}+x^{2}+2x-1}{x^{3}-1}$
$$\frac{2x^{3}+2x+x^{2}-1}{x^{3}-1}$$
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