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27=r/2
We move all terms to the left:
27-(r/2)=0
We add all the numbers together, and all the variables
-(+r/2)+27=0
We get rid of parentheses
-r/2+27=0
We multiply all the terms by the denominator
-r+27*2=0
We add all the numbers together, and all the variables
-1r+54=0
We move all terms containing r to the left, all other terms to the right
-r=-54
r=-54/-1
r=+54
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