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2n=4n-20
We move all terms to the left:
2n-(4n-20)=0
We get rid of parentheses
2n-4n+20=0
We add all the numbers together, and all the variables
-2n+20=0
We move all terms containing n to the left, all other terms to the right
-2n=-20
n=-20/-2
n=+10
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