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900=(n-2)(180)
We move all terms to the left:
900-((n-2)(180))=0
We calculate terms in parentheses: -((n-2)180), so:We get rid of parentheses
(n-2)180
We multiply parentheses
180n-360
Back to the equation:
-(180n-360)
-180n+360+900=0
We add all the numbers together, and all the variables
-180n+1260=0
We move all terms containing n to the left, all other terms to the right
-180n=-1260
n=-1260/-180
n=+7
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