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-15r-7r+-8r-12r+19r=15
We move all terms to the left:
-15r-7r+-8r-12r+19r-(15)=0
determiningTheFunctionDomain -15r-7r-8r-12r+19r-15+=0
We add all the numbers together, and all the variables
-23r=0
r=0/-23
r=0
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