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