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-(r-2)=2r-7
We move all terms to the left:
-(r-2)-(2r-7)=0
We get rid of parentheses
-r-2r+2+7=0
We add all the numbers together, and all the variables
-3r+9=0
We move all terms containing r to the left, all other terms to the right
-3r=-9
r=-9/-3
r=+3
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