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(-13)=n+18
We move all terms to the left:
(-13)-(n+18)=0
We add all the numbers together, and all the variables
-(n+18)-13=0
We get rid of parentheses
-n-18-13=0
We add all the numbers together, and all the variables
-1n-31=0
We move all terms containing n to the left, all other terms to the right
-n=31
n=31/-1
n=-31
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