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1680=(n-2)*180
We move all terms to the left:
1680-((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+1680=0
We add all the numbers together, and all the variables
-180n+2040=0
We move all terms containing n to the left, all other terms to the right
-180n=-2040
n=-2040/-180
n=11+1/3
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