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