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28=3w+w
We move all terms to the left:
28-(3w+w)=0
We add all the numbers together, and all the variables
-(+4w)+28=0
We get rid of parentheses
-4w+28=0
We move all terms containing w to the left, all other terms to the right
-4w=-28
w=-28/-4
w=+7
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