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1+r/3=4
We move all terms to the left:
1+r/3-(4)=0
We add all the numbers together, and all the variables
r/3-3=0
We multiply all the terms by the denominator
r-3*3=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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