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2(18+w)=58
We move all terms to the left:
2(18+w)-(58)=0
We add all the numbers together, and all the variables
2(w+18)-58=0
We multiply parentheses
2w+36-58=0
We add all the numbers together, and all the variables
2w-22=0
We move all terms containing w to the left, all other terms to the right
2w=22
w=22/2
w=11
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