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