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