Solve for y
y=\frac{x-15}{18}
Solve for x
x=18y+15
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18y+15=x
Swap sides so that all variable terms are on the left hand side.
18y=x-15
Subtract 15 from both sides.
\frac{18y}{18}=\frac{x-15}{18}
Divide both sides by 18.
y=\frac{x-15}{18}
Dividing by 18 undoes the multiplication by 18.
y=\frac{x}{18}-\frac{5}{6}
Divide x-15 by 18.
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