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