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4r=3+3r
We move all terms to the left:
4r-(3+3r)=0
We add all the numbers together, and all the variables
4r-(3r+3)=0
We get rid of parentheses
4r-3r-3=0
We add all the numbers together, and all the variables
r-3=0
We move all terms containing r to the left, all other terms to the right
r=3
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