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12/18+12r=1
We move all terms to the left:
12/18+12r-(1)=0
determiningTheFunctionDomain 12r-1+12/18=0
We multiply all the terms by the denominator
12r*18+12-1*18=0
We add all the numbers together, and all the variables
12r*18-6=0
Wy multiply elements
216r-6=0
We move all terms containing r to the left, all other terms to the right
216r=6
r=6/216
r=1/36
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