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w+(w+20)=380
We move all terms to the left:
w+(w+20)-(380)=0
We get rid of parentheses
w+w+20-380=0
We add all the numbers together, and all the variables
2w-360=0
We move all terms containing w to the left, all other terms to the right
2w=360
w=360/2
w=180
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