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-9=-4r+7r
We move all terms to the left:
-9-(-4r+7r)=0
We add all the numbers together, and all the variables
-(+3r)-9=0
We get rid of parentheses
-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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