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(r-5)(r-9)=1/2
We move all terms to the left:
(r-5)(r-9)-(1/2)=0
We add all the numbers together, and all the variables
(r-5)(r-9)-(+1/2)=0
We get rid of parentheses
(r-5)(r-9)-1/2=0
We multiply parentheses ..
(+r^2-9r-5r+45)-1/2=0
We multiply all the terms by the denominator
((+r^2-9r-5r+45))*2-1=0
We move all terms containing r to the left, all other terms to the right
((+r^2-9r-5r+45))*2=1
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