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-r-9=-2r
We move all terms to the left:
-r-9-(-2r)=0
We add all the numbers together, and all the variables
-1r-(-2r)-9=0
We get rid of parentheses
-1r+2r-9=0
We add all the numbers together, and all the variables
r-9=0
We move all terms containing r to the left, all other terms to the right
r=9
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