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-2(r+6)=21
We move all terms to the left:
-2(r+6)-(21)=0
We multiply parentheses
-2r-12-21=0
We add all the numbers together, and all the variables
-2r-33=0
We move all terms containing r to the left, all other terms to the right
-2r=33
r=33/-2
r=-16+1/2
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