Solve for n
n=8
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21-3n+3=0
Use the distributive property to multiply n-1 by -3.
24-3n=0
Add 21 and 3 to get 24.
-3n=-24
Subtract 24 from both sides. Anything subtracted from zero gives its negation.
n=\frac{-24}{-3}
Divide both sides by -3.
n=8
Divide -24 by -3 to get 8.
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