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280=165-w
We move all terms to the left:
280-(165-w)=0
We add all the numbers together, and all the variables
-(-1w+165)+280=0
We get rid of parentheses
1w-165+280=0
We add all the numbers together, and all the variables
w+115=0
We move all terms containing w to the left, all other terms to the right
w=-115
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