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10r=11r-20
We move all terms to the left:
10r-(11r-20)=0
We get rid of parentheses
10r-11r+20=0
We add all the numbers together, and all the variables
-1r+20=0
We move all terms containing r to the left, all other terms to the right
-r=-20
r=-20/-1
r=+20
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