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w+(w+12)=100
We move all terms to the left:
w+(w+12)-(100)=0
We get rid of parentheses
w+w+12-100=0
We add all the numbers together, and all the variables
2w-88=0
We move all terms containing w to the left, all other terms to the right
2w=88
w=88/2
w=44
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