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