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120w+150=550-80w
We move all terms to the left:
120w+150-(550-80w)=0
We add all the numbers together, and all the variables
120w-(-80w+550)+150=0
We get rid of parentheses
120w+80w-550+150=0
We add all the numbers together, and all the variables
200w-400=0
We move all terms containing w to the left, all other terms to the right
200w=400
w=400/200
w=2
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