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8+r/9=9
We move all terms to the left:
8+r/9-(9)=0
We add all the numbers together, and all the variables
r/9-1=0
We multiply all the terms by the denominator
r-1*9=0
We add all the numbers together, and all the variables
r-9=0
We move all terms containing r to the left, all other terms to the right
r=9
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