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9w=3w+12
We move all terms to the left:
9w-(3w+12)=0
We get rid of parentheses
9w-3w-12=0
We add all the numbers together, and all the variables
6w-12=0
We move all terms containing w to the left, all other terms to the right
6w=12
w=12/6
w=2
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