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9=-6r-3r
We move all terms to the left:
9-(-6r-3r)=0
We add all the numbers together, and all the variables
-(-9r)+9=0
We get rid of parentheses
9r+9=0
We move all terms containing r to the left, all other terms to the right
9r=-9
r=-9/9
r=-1
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