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-r+9=-11-6r
We move all terms to the left:
-r+9-(-11-6r)=0
We add all the numbers together, and all the variables
-r-(-6r-11)+9=0
We add all the numbers together, and all the variables
-1r-(-6r-11)+9=0
We get rid of parentheses
-1r+6r+11+9=0
We add all the numbers together, and all the variables
5r+20=0
We move all terms containing r to the left, all other terms to the right
5r=-20
r=-20/5
r=-4
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