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27=n/21
We move all terms to the left:
27-(n/21)=0
We add all the numbers together, and all the variables
-(+n/21)+27=0
We get rid of parentheses
-n/21+27=0
We multiply all the terms by the denominator
-n+27*21=0
We add all the numbers together, and all the variables
-1n+567=0
We move all terms containing n to the left, all other terms to the right
-n=-567
n=-567/-1
n=+567
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