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-(r-3)=-r+3
We move all terms to the left:
-(r-3)-(-r+3)=0
We add all the numbers together, and all the variables
-(r-3)-(-1r+3)=0
We get rid of parentheses
-r+1r+3-3=0
We add all the numbers together, and all the variables
=0
r=0/1
r=0
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