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180=r/2
We move all terms to the left:
180-(r/2)=0
We add all the numbers together, and all the variables
-(+r/2)+180=0
We get rid of parentheses
-r/2+180=0
We multiply all the terms by the denominator
-r+180*2=0
We add all the numbers together, and all the variables
-1r+360=0
We move all terms containing r to the left, all other terms to the right
-r=-360
r=-360/-1
r=+360
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