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6n-20=14n-84
We move all terms to the left:
6n-20-(14n-84)=0
We get rid of parentheses
6n-14n+84-20=0
We add all the numbers together, and all the variables
-8n+64=0
We move all terms containing n to the left, all other terms to the right
-8n=-64
n=-64/-8
n=+8
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