$$(a+6)(a^{2}-a6+6^{2})$$
$\left(a+6\right)\left(a^{2}-a_{6}+36\right)$
$$\left(a+6\right)\left(a^{2}-a_{6}+36\right)$$
$$a^{3}-aa_{6}+36a+6a^{2}-6a_{6}+216$$
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$a^{3}+6a^{2}-aa_{6}+36a-6a_{6}+216$
