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1+r/9=3
We move all terms to the left:
1+r/9-(3)=0
We add all the numbers together, and all the variables
r/9-2=0
We multiply all the terms by the denominator
r-2*9=0
We add all the numbers together, and all the variables
r-18=0
We move all terms containing r to the left, all other terms to the right
r=18
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