Solve for n
n=-\frac{a_{n}}{4}+\frac{15}{2}
Solve for a_n
a_{n}=30-4n
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30-4n=a_{n}
Swap sides so that all variable terms are on the left hand side.
-4n=a_{n}-30
Subtract 30 from both sides.
\frac{-4n}{-4}=\frac{a_{n}-30}{-4}
Divide both sides by -4.
n=\frac{a_{n}-30}{-4}
Dividing by -4 undoes the multiplication by -4.
n=-\frac{a_{n}}{4}+\frac{15}{2}
Divide a_{n}-30 by -4.
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