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4r+8=28r+16
We move all terms to the left:
4r+8-(28r+16)=0
We get rid of parentheses
4r-28r-16+8=0
We add all the numbers together, and all the variables
-24r-8=0
We move all terms containing r to the left, all other terms to the right
-24r=8
r=8/-24
r=-1/3
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