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6=13r-1
We move all terms to the left:
6-(13r-1)=0
We get rid of parentheses
-13r+1+6=0
We add all the numbers together, and all the variables
-13r+7=0
We move all terms containing r to the left, all other terms to the right
-13r=-7
r=-7/-13
r=7/13
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