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-3(n+)=3
We move all terms to the left:
-3(n+)-(3)=0
We add all the numbers together, and all the variables
-3(+n)-3=0
We multiply parentheses
-3n-3=0
We move all terms containing n to the left, all other terms to the right
-3n=3
n=3/-3
n=-1
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