(n+-2)*180=140n

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Solution for (n+-2)*180=140n equation: 



(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

(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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