Solve for n
n=\frac{a-3}{2}
Solve for a
a=2n+3
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3+2n=a
Swap sides so that all variable terms are on the left hand side.
2n=a-3
Subtract 3 from both sides.
\frac{2n}{2}=\frac{a-3}{2}
Divide both sides by 2.
n=\frac{a-3}{2}
Dividing by 2 undoes the multiplication by 2.
Examples
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Limits
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