129=(n-2)*180/n

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Solution for 129=(n-2)*180/n equation:



129=(n-2)*180/n
We move all terms to the left:
129-((n-2)*180/n)=0
Domain of the equation: n)!=0
n!=0/1
n!=0
n∈R
We multiply all the terms by the denominator
-((n-2)*180+129*n)=0
We calculate terms in parentheses: -((n-2)*180+129*n), so:
(n-2)*180+129*n
We add all the numbers together, and all the variables
129n+(n-2)*180
We multiply parentheses
129n+180n-360
We add all the numbers together, and all the variables
309n-360
Back to the equation:
-(309n-360)
We get rid of parentheses
-309n+360=0
We move all terms containing n to the left, all other terms to the right
-309n=-360
n=-360/-309
n=1+17/103

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