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-24=-4r+8r
We move all terms to the left:
-24-(-4r+8r)=0
We add all the numbers together, and all the variables
-(+4r)-24=0
We get rid of parentheses
-4r-24=0
We move all terms containing r to the left, all other terms to the right
-4r=24
r=24/-4
r=-6
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