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20n+120=120+20n
We move all terms to the left:
20n+120-(120+20n)=0
We add all the numbers together, and all the variables
20n-(20n+120)+120=0
We get rid of parentheses
20n-20n-120+120=0
We add all the numbers together, and all the variables
=0
n=0/1
n=0
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