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