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-r-12/6=7
We move all terms to the left:
-r-12/6-(7)=0
determiningTheFunctionDomain -r-7-12/6=0
We add all the numbers together, and all the variables
-1r-9=0
We move all terms containing r to the left, all other terms to the right
-r=9
r=9/-1
r=-9
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