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r-12/(-9)=3
We move all terms to the left:
r-12/(-9)-(3)=0
determiningTheFunctionDomain r-3-12/(-9)=0
We multiply all the terms by the denominator
r*(-9)-12-3*(-9)=0
We add all the numbers together, and all the variables
r*(-9)+15=0
We multiply parentheses
-9r+15=0
We move all terms containing r to the left, all other terms to the right
-9r=-15
r=-15/-9
r=1+2/3
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