Solve for b
b=\frac{s-18u}{18}
Solve for s
s=18\left(u+b\right)
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18b+18u=s
Swap sides so that all variable terms are on the left hand side.
18b=s-18u
Subtract 18u from both sides.
\frac{18b}{18}=\frac{s-18u}{18}
Divide both sides by 18.
b=\frac{s-18u}{18}
Dividing by 18 undoes the multiplication by 18.
b=\frac{s}{18}-u
Divide s-18u by 18.
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