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-27=r/13-19
We move all terms to the left:
-27-(r/13-19)=0
We get rid of parentheses
-r/13+19-27=0
We multiply all the terms by the denominator
-r+19*13-27*13=0
We add all the numbers together, and all the variables
-1r-104=0
We move all terms containing r to the left, all other terms to the right
-r=104
r=104/-1
r=-104
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