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r/9-85=-76
We move all terms to the left:
r/9-85-(-76)=0
We add all the numbers together, and all the variables
r/9-9=0
We multiply all the terms by the denominator
r-9*9=0
We add all the numbers together, and all the variables
r-81=0
We move all terms containing r to the left, all other terms to the right
r=81
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