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20-2n=8n+4
We move all terms to the left:
20-2n-(8n+4)=0
We get rid of parentheses
-2n-8n-4+20=0
We add all the numbers together, and all the variables
-10n+16=0
We move all terms containing n to the left, all other terms to the right
-10n=-16
n=-16/-10
n=1+3/5
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