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2w-19=3w-40
We move all terms to the left:
2w-19-(3w-40)=0
We get rid of parentheses
2w-3w+40-19=0
We add all the numbers together, and all the variables
-1w+21=0
We move all terms containing w to the left, all other terms to the right
-w=-21
w=-21/-1
w=+21
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