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28.8-2w=3.2
We move all terms to the left:
28.8-2w-(3.2)=0
We add all the numbers together, and all the variables
-2w+25.6=0
We move all terms containing w to the left, all other terms to the right
-2w=-25.6
w=-25.6/-2
w=12+1/1.25
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