$$12 ( x ^ { 3 } + x ^ { 2 } + x + 1 ) 18 ( x ^ { 4 } - 1 )$$
$216\left(x-1\right)\left(\left(x+1\right)\left(x^{2}+1\right)\right)^{2}$
$$216\left(x^{3}+x^{2}+x+1\right)\left(x^{4}-1\right)$$
$$\left(216x^{3}+216x^{2}+216x+216\right)\left(x^{4}-1\right)$$
$$216x^{7}-216x^{3}+216x^{6}-216x^{2}+216x^{5}-216x+216x^{4}-216$$
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$216x^{7}+216x^{6}+216x^{5}+216x^{4}-216x^{3}-216x^{2}-216x-216$
