Solve for n
n=4
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3n-9=3
Swap sides so that all variable terms are on the left hand side.
3n=3+9
Add 9 to both sides.
3n=12
Add 3 and 9 to get 12.
n=\frac{12}{3}
Divide both sides by 3.
n=4
Divide 12 by 3 to get 4.
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