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r/8-11=-9
We move all terms to the left:
r/8-11-(-9)=0
We add all the numbers together, and all the variables
r/8-2=0
We multiply all the terms by the denominator
r-2*8=0
We add all the numbers together, and all the variables
r-16=0
We move all terms containing r to the left, all other terms to the right
r=16
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