Solve for n
n=\frac{-a_{n}-7}{10}
Solve for a_n
a_{n}=-10n-7
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-10n-7=a_{n}
Swap sides so that all variable terms are on the left hand side.
-10n=a_{n}+7
Add 7 to both sides.
\frac{-10n}{-10}=\frac{a_{n}+7}{-10}
Divide both sides by -10.
n=\frac{a_{n}+7}{-10}
Dividing by -10 undoes the multiplication by -10.
n=\frac{-a_{n}-7}{10}
Divide a_{n}+7 by -10.
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