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-19r=-11-20r
We move all terms to the left:
-19r-(-11-20r)=0
We add all the numbers together, and all the variables
-19r-(-20r-11)=0
We get rid of parentheses
-19r+20r+11=0
We add all the numbers together, and all the variables
r+11=0
We move all terms containing r to the left, all other terms to the right
r=-11
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