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180=115+2r-5
We move all terms to the left:
180-(115+2r-5)=0
We add all the numbers together, and all the variables
-(2r+110)+180=0
We get rid of parentheses
-2r-110+180=0
We add all the numbers together, and all the variables
-2r+70=0
We move all terms containing r to the left, all other terms to the right
-2r=-70
r=-70/-2
r=+35
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