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(n-20)180=720
We move all terms to the left:
(n-20)180-(720)=0
We multiply parentheses
180n-3600-720=0
We add all the numbers together, and all the variables
180n-4320=0
We move all terms containing n to the left, all other terms to the right
180n=4320
n=4320/180
n=24
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