$$(a-b)^{3}-8(a-6)^{3}$$
$\left(12-b-a\right)\left(7a^{2}-4ab-60a+b^{2}+12b+144\right)$
$1728-3ba^{2}-b^{3}-864a+3ab^{2}+144a^{2}-7a^{3}$
