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1=2r-11
We move all terms to the left:
1-(2r-11)=0
We get rid of parentheses
-2r+11+1=0
We add all the numbers together, and all the variables
-2r+12=0
We move all terms containing r to the left, all other terms to the right
-2r=-12
r=-12/-2
r=+6
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