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-9=r/12
We move all terms to the left:
-9-(r/12)=0
We add all the numbers together, and all the variables
-(+r/12)-9=0
We get rid of parentheses
-r/12-9=0
We multiply all the terms by the denominator
-r-9*12=0
We add all the numbers together, and all the variables
-1r-108=0
We move all terms containing r to the left, all other terms to the right
-r=108
r=108/-1
r=-108
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