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11=r/2+8
We move all terms to the left:
11-(r/2+8)=0
We get rid of parentheses
-r/2-8+11=0
We multiply all the terms by the denominator
-r-8*2+11*2=0
We add all the numbers together, and all the variables
-1r+6=0
We move all terms containing r to the left, all other terms to the right
-r=-6
r=-6/-1
r=+6
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