$$H=105-1^{6}c$$
$c=105-H$
$$H=105-c$$
$$105-c=H$$
$$-c=H-105$$
$$\frac{-c}{-1}=\frac{H-105}{-1}$$
$$c=\frac{H-105}{-1}$$
$$c=105-H$$
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$H=105-c$