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3w+12=4w-28
We move all terms to the left:
3w+12-(4w-28)=0
We get rid of parentheses
3w-4w+28+12=0
We add all the numbers together, and all the variables
-1w+40=0
We move all terms containing w to the left, all other terms to the right
-w=-40
w=-40/-1
w=+40
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