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-2.1+5w=10.4
We move all terms to the left:
-2.1+5w-(10.4)=0
We add all the numbers together, and all the variables
5w-12.5=0
We move all terms containing w to the left, all other terms to the right
5w=12.5
w=12.5/5
w=2+2.5/5
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