Solve for y
y=13-c
Solve for c
c=13-y
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13-y=c
Swap sides so that all variable terms are on the left hand side.
-y=c-13
Subtract 13 from both sides.
\frac{-y}{-1}=\frac{c-13}{-1}
Divide both sides by -1.
y=\frac{c-13}{-1}
Dividing by -1 undoes the multiplication by -1.
y=13-c
Divide c-13 by -1.
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