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28=8w-20
We move all terms to the left:
28-(8w-20)=0
We get rid of parentheses
-8w+20+28=0
We add all the numbers together, and all the variables
-8w+48=0
We move all terms containing w to the left, all other terms to the right
-8w=-48
w=-48/-8
w=+6
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