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39=3w-15
We move all terms to the left:
39-(3w-15)=0
We get rid of parentheses
-3w+15+39=0
We add all the numbers together, and all the variables
-3w+54=0
We move all terms containing w to the left, all other terms to the right
-3w=-54
w=-54/-3
w=+18
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