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(w-20)+(w-20)+2w-20=180
We move all terms to the left:
(w-20)+(w-20)+2w-20-(180)=0
We add all the numbers together, and all the variables
2w+(w-20)+(w-20)-200=0
We get rid of parentheses
2w+w+w-20-20-200=0
We add all the numbers together, and all the variables
4w-240=0
We move all terms containing w to the left, all other terms to the right
4w=240
w=240/4
w=60
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