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-13=1+3n-2
We move all terms to the left:
-13-(1+3n-2)=0
We add all the numbers together, and all the variables
-(3n-1)-13=0
We get rid of parentheses
-3n+1-13=0
We add all the numbers together, and all the variables
-3n-12=0
We move all terms containing n to the left, all other terms to the right
-3n=12
n=12/-3
n=-4
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