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18=24-8r
We move all terms to the left:
18-(24-8r)=0
We add all the numbers together, and all the variables
-(-8r+24)+18=0
We get rid of parentheses
8r-24+18=0
We add all the numbers together, and all the variables
8r-6=0
We move all terms containing r to the left, all other terms to the right
8r=6
r=6/8
r=3/4
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