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3.9w-17.9=17.9
We move all terms to the left:
3.9w-17.9-(17.9)=0
We add all the numbers together, and all the variables
3.9w-35.8=0
We move all terms containing w to the left, all other terms to the right
3.9w=35.8
w=35.8/3.9
w=9+0.7/3.9
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