Solve for b
b=\frac{9c}{10}
Solve for c
c=\frac{10b}{9}
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10b=9c
Combine 3b and 7b to get 10b.
\frac{10b}{10}=\frac{9c}{10}
Divide both sides by 10.
b=\frac{9c}{10}
Dividing by 10 undoes the multiplication by 10.
10b=9c
Combine 3b and 7b to get 10b.
9c=10b
Swap sides so that all variable terms are on the left hand side.
\frac{9c}{9}=\frac{10b}{9}
Divide both sides by 9.
c=\frac{10b}{9}
Dividing by 9 undoes the multiplication by 9.
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