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-(n-1)=3
We move all terms to the left:
-(n-1)-(3)=0
We get rid of parentheses
-n+1-3=0
We add all the numbers together, and all the variables
-1n-2=0
We move all terms containing n to the left, all other terms to the right
-n=2
n=2/-1
n=-2
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