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-12=n-5-4
We move all terms to the left:
-12-(n-5-4)=0
We add all the numbers together, and all the variables
-(n-9)-12=0
We get rid of parentheses
-n+9-12=0
We add all the numbers together, and all the variables
-1n-3=0
We move all terms containing n to the left, all other terms to the right
-n=3
n=3/-1
n=-3
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