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-5=-18+n
We move all terms to the left:
-5-(-18+n)=0
We add all the numbers together, and all the variables
-(n-18)-5=0
We get rid of parentheses
-n+18-5=0
We add all the numbers together, and all the variables
-1n+13=0
We move all terms containing n to the left, all other terms to the right
-n=-13
n=-13/-1
n=+13
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