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r/12+13/12=1
We move all terms to the left:
r/12+13/12-(1)=0
determiningTheFunctionDomain r/12-1+13/12=0
We multiply all the terms by the denominator
r+13-1*12=0
We add all the numbers together, and all the variables
r+1=0
We move all terms containing r to the left, all other terms to the right
r=-1
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