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Solve for n
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Solve for a_n
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2n-5=a_{n}
Swap sides so that all variable terms are on the left hand side.
2n=a_{n}+5
Add 5 to both sides.
\frac{2n}{2}=\frac{a_{n}+5}{2}
Divide both sides by 2.
n=\frac{a_{n}+5}{2}
Dividing by 2 undoes the multiplication by 2.