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9+r/3=1
We move all terms to the left:
9+r/3-(1)=0
We add all the numbers together, and all the variables
r/3+8=0
We multiply all the terms by the denominator
r+8*3=0
We add all the numbers together, and all the variables
r+24=0
We move all terms containing r to the left, all other terms to the right
r=-24
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