$$5a+8b+6c; 4a-5b-6c$$
$-\left(4a-5b-6c\right)\left(5a+8b+6c\right)$
$$-\left(4a-5b-6c\right)\left(5a+8b+6c\right)$$
$$-20a^{2}-7ab+6ac+40b^{2}+78bc+36c^{2}$$
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$5a+8b+6c,\ 4a-5b-6c$
