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2w+(w-7)+(w-13)=180
We move all terms to the left:
2w+(w-7)+(w-13)-(180)=0
We get rid of parentheses
2w+w+w-7-13-180=0
We add all the numbers together, and all the variables
4w-200=0
We move all terms containing w to the left, all other terms to the right
4w=200
w=200/4
w=50
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