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24=4r+28
We move all terms to the left:
24-(4r+28)=0
We get rid of parentheses
-4r-28+24=0
We add all the numbers together, and all the variables
-4r-4=0
We move all terms containing r to the left, all other terms to the right
-4r=4
r=4/-4
r=-1
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