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15w=12w-9
We move all terms to the left:
15w-(12w-9)=0
We get rid of parentheses
15w-12w+9=0
We add all the numbers together, and all the variables
3w+9=0
We move all terms containing w to the left, all other terms to the right
3w=-9
w=-9/3
w=-3
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