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65=r/6-13
We move all terms to the left:
65-(r/6-13)=0
We get rid of parentheses
-r/6+13+65=0
We multiply all the terms by the denominator
-r+13*6+65*6=0
We add all the numbers together, and all the variables
-1r+468=0
We move all terms containing r to the left, all other terms to the right
-r=-468
r=-468/-1
r=+468
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