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3r-6=6r+21r
We move all terms to the left:
3r-6-(6r+21r)=0
We add all the numbers together, and all the variables
3r-(+27r)-6=0
We get rid of parentheses
3r-27r-6=0
We add all the numbers together, and all the variables
-24r-6=0
We move all terms containing r to the left, all other terms to the right
-24r=6
r=6/-24
r=-1/4
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