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11=r/2+5
We move all terms to the left:
11-(r/2+5)=0
We get rid of parentheses
-r/2-5+11=0
We multiply all the terms by the denominator
-r-5*2+11*2=0
We add all the numbers together, and all the variables
-1r+12=0
We move all terms containing r to the left, all other terms to the right
-r=-12
r=-12/-1
r=+12
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