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-20(r-11)-9=9r-50
We move all terms to the left:
-20(r-11)-9-(9r-50)=0
We multiply parentheses
-20r-(9r-50)+220-9=0
We get rid of parentheses
-20r-9r+50+220-9=0
We add all the numbers together, and all the variables
-29r+261=0
We move all terms containing r to the left, all other terms to the right
-29r=-261
r=-261/-29
r=+9
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