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-4.5+3.5w=10.3
We move all terms to the left:
-4.5+3.5w-(10.3)=0
We add all the numbers together, and all the variables
3.5w-14.8=0
We move all terms containing w to the left, all other terms to the right
3.5w=14.8
w=14.8/3.5
w=4+0.8/3.5
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