$$C-8CM,d-5CM$$
$C\left(1-8M\right)\left(5CM-d\right)$
$$C-8CM=C\left(-8M+1\right)$$
$$C\left(1-8M\right)\left(5CM-d\right)$$
$$-40C^{2}M^{2}+8CMd-Cd+5MC^{2}$$
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$C-8CM,d-5CM$