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21=n/25
We move all terms to the left:
21-(n/25)=0
We add all the numbers together, and all the variables
-(+n/25)+21=0
We get rid of parentheses
-n/25+21=0
We multiply all the terms by the denominator
-n+21*25=0
We add all the numbers together, and all the variables
-1n+525=0
We move all terms containing n to the left, all other terms to the right
-n=-525
n=-525/-1
n=+525
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