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2(w)+2(w+20)=640
We move all terms to the left:
2(w)+2(w+20)-(640)=0
We multiply parentheses
2w+2w+40-640=0
We add all the numbers together, and all the variables
4w-600=0
We move all terms containing w to the left, all other terms to the right
4w=600
w=600/4
w=150
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