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11=+r/9=4
We move all terms to the left:
11-(+r/9)=0
We get rid of parentheses
-r/9+11=0
We multiply all the terms by the denominator
-r+11*9=0
We add all the numbers together, and all the variables
-1r+99=0
We move all terms containing r to the left, all other terms to the right
-r=-99
r=-99/-1
r=+99
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