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-13=r/6+8
We move all terms to the left:
-13-(r/6+8)=0
We get rid of parentheses
-r/6-8-13=0
We multiply all the terms by the denominator
-r-8*6-13*6=0
We add all the numbers together, and all the variables
-1r-126=0
We move all terms containing r to the left, all other terms to the right
-r=126
r=126/-1
r=-126
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