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r/8-7=-1
We move all terms to the left:
r/8-7-(-1)=0
We add all the numbers together, and all the variables
r/8-6=0
We multiply all the terms by the denominator
r-6*8=0
We add all the numbers together, and all the variables
r-48=0
We move all terms containing r to the left, all other terms to the right
r=48
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