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39=2w+12
We move all terms to the left:
39-(2w+12)=0
We get rid of parentheses
-2w-12+39=0
We add all the numbers together, and all the variables
-2w+27=0
We move all terms containing w to the left, all other terms to the right
-2w=-27
w=-27/-2
w=13+1/2
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