Solve for n
n=\frac{a_{n}-10}{3}
Solve for a_n
a_{n}=3n+10
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3n+10=a_{n}
Swap sides so that all variable terms are on the left hand side.
3n=a_{n}-10
Subtract 10 from both sides.
\frac{3n}{3}=\frac{a_{n}-10}{3}
Divide both sides by 3.
n=\frac{a_{n}-10}{3}
Dividing by 3 undoes the multiplication by 3.
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