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11-20r=-19r-5
We move all terms to the left:
11-20r-(-19r-5)=0
We get rid of parentheses
-20r+19r+5+11=0
We add all the numbers together, and all the variables
-1r+16=0
We move all terms containing r to the left, all other terms to the right
-r=-16
r=-16/-1
r=+16
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