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