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180(n-2)=7020
We move all terms to the left:
180(n-2)-(7020)=0
We multiply parentheses
180n-360-7020=0
We add all the numbers together, and all the variables
180n-7380=0
We move all terms containing n to the left, all other terms to the right
180n=7380
n=7380/180
n=41
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