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(n-2)180=3420
We move all terms to the left:
(n-2)180-(3420)=0
We multiply parentheses
180n-360-3420=0
We add all the numbers together, and all the variables
180n-3780=0
We move all terms containing n to the left, all other terms to the right
180n=3780
n=3780/180
n=21
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