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