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-1/18=r/18
We move all terms to the left:
-1/18-(r/18)=0
We add all the numbers together, and all the variables
-(+r/18)-1/18=0
We get rid of parentheses
-r/18-1/18=0
We multiply all the terms by the denominator
-r-1=0
We add all the numbers together, and all the variables
-1r-1=0
We move all terms containing r to the left, all other terms to the right
-r=1
r=1/-1
r=-1
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