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12=6w+18-9w
We move all terms to the left:
12-(6w+18-9w)=0
We add all the numbers together, and all the variables
-(-3w+18)+12=0
We get rid of parentheses
3w-18+12=0
We add all the numbers together, and all the variables
3w-6=0
We move all terms containing w to the left, all other terms to the right
3w=6
w=6/3
w=2
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