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4+r/3=11
We move all terms to the left:
4+r/3-(11)=0
We add all the numbers together, and all the variables
r/3-7=0
We multiply all the terms by the denominator
r-7*3=0
We add all the numbers together, and all the variables
r-21=0
We move all terms containing r to the left, all other terms to the right
r=21
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