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3r-1=1-3r
We move all terms to the left:
3r-1-(1-3r)=0
We add all the numbers together, and all the variables
3r-(-3r+1)-1=0
We get rid of parentheses
3r+3r-1-1=0
We add all the numbers together, and all the variables
6r-2=0
We move all terms containing r to the left, all other terms to the right
6r=2
r=2/6
r=1/3
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