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2r-4(-3)=8
We move all terms to the left:
2r-4(-3)-(8)=0
determiningTheFunctionDomain 2r-8-4(-3)=0
We add all the numbers together, and all the variables
2r+4=0
We move all terms containing r to the left, all other terms to the right
2r=-4
r=-4/2
r=-2
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