Solve for d
d=\frac{c-15}{30}
Solve for c
c=30d+15
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30d+15=c
Swap sides so that all variable terms are on the left hand side.
30d=c-15
Subtract 15 from both sides.
\frac{30d}{30}=\frac{c-15}{30}
Divide both sides by 30.
d=\frac{c-15}{30}
Dividing by 30 undoes the multiplication by 30.
d=\frac{c}{30}-\frac{1}{2}
Divide c-15 by 30.
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