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r/8+5=85
We move all terms to the left:
r/8+5-(85)=0
We add all the numbers together, and all the variables
r/8-80=0
We multiply all the terms by the denominator
r-80*8=0
We add all the numbers together, and all the variables
r-640=0
We move all terms containing r to the left, all other terms to the right
r=640
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