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3w+18=5w-12
We move all terms to the left:
3w+18-(5w-12)=0
We get rid of parentheses
3w-5w+12+18=0
We add all the numbers together, and all the variables
-2w+30=0
We move all terms containing w to the left, all other terms to the right
-2w=-30
w=-30/-2
w=+15
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