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