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12=3w-12
We move all terms to the left:
12-(3w-12)=0
We get rid of parentheses
-3w+12+12=0
We add all the numbers together, and all the variables
-3w+24=0
We move all terms containing w to the left, all other terms to the right
-3w=-24
w=-24/-3
w=+8
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