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r/8+1=13
We move all terms to the left:
r/8+1-(13)=0
We add all the numbers together, and all the variables
r/8-12=0
We multiply all the terms by the denominator
r-12*8=0
We add all the numbers together, and all the variables
r-96=0
We move all terms containing r to the left, all other terms to the right
r=96
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