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1+n=-13+3n
We move all terms to the left:
1+n-(-13+3n)=0
We add all the numbers together, and all the variables
n-(3n-13)+1=0
We get rid of parentheses
n-3n+13+1=0
We add all the numbers together, and all the variables
-2n+14=0
We move all terms containing n to the left, all other terms to the right
-2n=-14
n=-14/-2
n=+7
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