Solve for d
d=\frac{c-8}{4}
Solve for c
c=4\left(d+2\right)
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4d+8=c
Swap sides so that all variable terms are on the left hand side.
4d=c-8
Subtract 8 from both sides.
\frac{4d}{4}=\frac{c-8}{4}
Divide both sides by 4.
d=\frac{c-8}{4}
Dividing by 4 undoes the multiplication by 4.
d=\frac{c}{4}-2
Divide c-8 by 4.
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