$$\frac{ x+1 }{ 3 { x }^{ 3 } - { x }^{ 2 } -3x+1 }$$
$\frac{1}{\left(x-1\right)\left(3x-1\right)}$
$$\frac{x+1}{\left(x-1\right)\left(3x-1\right)\left(x+1\right)}$$
$$\frac{1}{\left(x-1\right)\left(3x-1\right)}$$
$$\frac{1}{3x^{2}-4x+1}$$
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$\frac{1}{3x^{2}-4x+1}$