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-13.68-2.1w=15w
We move all terms to the left:
-13.68-2.1w-(15w)=0
We add all the numbers together, and all the variables
-17.1w-13.68=0
We move all terms containing w to the left, all other terms to the right
-17.1w=13.68
w=13.68/-17.1
w=-8.1428571428571/10.178571428571
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