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