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