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(n-2)(180)=140n
We move all terms to the left:
(n-2)(180)-(140n)=0
We add all the numbers together, and all the variables
-140n+(n-2)180=0
We multiply parentheses
-140n+180n-360=0
We add all the numbers together, and all the variables
40n-360=0
We move all terms containing n to the left, all other terms to the right
40n=360
n=360/40
n=9
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