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w+w+(w+20)+(w+20)=380
We move all terms to the left:
w+w+(w+20)+(w+20)-(380)=0
We add all the numbers together, and all the variables
2w+(w+20)+(w+20)-380=0
We get rid of parentheses
2w+w+w+20+20-380=0
We add all the numbers together, and all the variables
4w-340=0
We move all terms containing w to the left, all other terms to the right
4w=340
w=340/4
w=85
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