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28r-168=6r-3
We move all terms to the left:
28r-168-(6r-3)=0
We get rid of parentheses
28r-6r+3-168=0
We add all the numbers together, and all the variables
22r-165=0
We move all terms containing r to the left, all other terms to the right
22r=165
r=165/22
r=7+1/2
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