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-(r-19)=6
We move all terms to the left:
-(r-19)-(6)=0
We get rid of parentheses
-r+19-6=0
We add all the numbers together, and all the variables
-1r+13=0
We move all terms containing r to the left, all other terms to the right
-r=-13
r=-13/-1
r=+13
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