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