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50w+100=40w+250
We move all terms to the left:
50w+100-(40w+250)=0
We get rid of parentheses
50w-40w-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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