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2w-84=3w-91
We move all terms to the left:
2w-84-(3w-91)=0
We get rid of parentheses
2w-3w+91-84=0
We add all the numbers together, and all the variables
-1w+7=0
We move all terms containing w to the left, all other terms to the right
-w=-7
w=-7/-1
w=+7
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