$$\left. \begin{array} { l } { 3 x ^ { 4 } - 2 x - 5 + x - 5 x } \\ { + 3 x ^ { 3 } + 3 x ^ { 2 } - x - 1 } \end{array} \right.$$
$\left(x+1\right)\left(3x^{2}-1\right)\left(3x^{4}-6x-5\right)$
$$\left(x+1\right)\left(3x^{2}-1\right)\left(3x^{4}-6x-5\right)$$
$$9x^{7}+9x^{6}-3x^{5}-21x^{4}-33x^{3}-9x^{2}+11x+5$$
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$3x^{4}-6x-5,\ \left(x+1\right)\left(3x^{2}-1\right)$
