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27=21-3r
We move all terms to the left:
27-(21-3r)=0
We add all the numbers together, and all the variables
-(-3r+21)+27=0
We get rid of parentheses
3r-21+27=0
We add all the numbers together, and all the variables
3r+6=0
We move all terms containing r to the left, all other terms to the right
3r=-6
r=-6/3
r=-2
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