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(w+28)+(w+43)+(2w+45)=180
We move all terms to the left:
(w+28)+(w+43)+(2w+45)-(180)=0
We get rid of parentheses
w+w+2w+28+43+45-180=0
We add all the numbers together, and all the variables
4w-64=0
We move all terms containing w to the left, all other terms to the right
4w=64
w=64/4
w=16
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