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-0.2+3.9=13w
We move all terms to the left:
-0.2+3.9-(13w)=0
We add all the numbers together, and all the variables
-13w+3.7=0
We move all terms containing w to the left, all other terms to the right
-13w=-3.7
w=-3.7/-13
w=2.1764705882353/7.6470588235294
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