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80=8n+4
We move all terms to the left:
80-(8n+4)=0
We get rid of parentheses
-8n-4+80=0
We add all the numbers together, and all the variables
-8n+76=0
We move all terms containing n to the left, all other terms to the right
-8n=-76
n=-76/-8
n=9+1/2
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