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-20r+-12r-6r+2r-20=16
We move all terms to the left:
-20r+-12r-6r+2r-20-(16)=0
determiningTheFunctionDomain -20r-12r-6r+2r-20-16+=0
We add all the numbers together, and all the variables
-36r=0
r=0/-36
r=0
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