Solve for n
n=1
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2n+9+n=12
Add n to both sides.
3n+9=12
Combine 2n and n to get 3n.
3n=12-9
Subtract 9 from both sides.
3n=3
Subtract 9 from 12 to get 3.
n=\frac{3}{3}
Divide both sides by 3.
n=1
Divide 3 by 3 to get 1.
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