(n+-2)*180=120n

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Solution for (n+-2)*180=120n equation: 



(n+-2)*180=120n

We move all terms to the left:

(n+-2)*180-(120n)=0

We add all the numbers together, and all the variables

(n-2)*180-120n=0

We add all the numbers together, and all the variables

-120n+(n-2)*180=0

We multiply parentheses

-120n+180n-360=0

We add all the numbers together, and all the variables

60n-360=0

We move all terms containing n to the left, all other terms to the right

60n=360

n=360/60

n=6

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