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100+80w=250+70w
We move all terms to the left:
100+80w-(250+70w)=0
We add all the numbers together, and all the variables
80w-(70w+250)+100=0
We get rid of parentheses
80w-70w-250+100=0
We add all the numbers together, and all the variables
10w-150=0
We move all terms containing w to the left, all other terms to the right
10w=150
w=150/10
w=15
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