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30=3w-12
We move all terms to the left:
30-(3w-12)=0
We get rid of parentheses
-3w+12+30=0
We add all the numbers together, and all the variables
-3w+42=0
We move all terms containing w to the left, all other terms to the right
-3w=-42
w=-42/-3
w=+14
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