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-9+r/3=2
We move all terms to the left:
-9+r/3-(2)=0
We add all the numbers together, and all the variables
r/3-11=0
We multiply all the terms by the denominator
r-11*3=0
We add all the numbers together, and all the variables
r-33=0
We move all terms containing r to the left, all other terms to the right
r=33
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