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-31=-12+n
We move all terms to the left:
-31-(-12+n)=0
We add all the numbers together, and all the variables
-(n-12)-31=0
We get rid of parentheses
-n+12-31=0
We add all the numbers together, and all the variables
-1n-19=0
We move all terms containing n to the left, all other terms to the right
-n=19
n=19/-1
n=-19
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