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21+6r=3r-6
We move all terms to the left:
21+6r-(3r-6)=0
We get rid of parentheses
6r-3r+6+21=0
We add all the numbers together, and all the variables
3r+27=0
We move all terms containing r to the left, all other terms to the right
3r=-27
r=-27/3
r=-9
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