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(12/20)=(n/21)
We move all terms to the left:
(12/20)-((n/21))=0
We add all the numbers together, and all the variables
-((+n/21))+(+12/20)=0
We get rid of parentheses
-((+n/21))+12/20=0
We calculate fractions
(-((+n*20)/()+()/()=0
We calculate terms in parentheses: +(-((+n*20)/()+()/(), so:
-((+n*20)/()+()/(
We can not solve this equation
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