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-w/2+12=20
We move all terms to the left:
-w/2+12-(20)=0
We add all the numbers together, and all the variables
-w/2-8=0
We multiply all the terms by the denominator
-w-8*2=0
We add all the numbers together, and all the variables
-1w-16=0
We move all terms containing w to the left, all other terms to the right
-w=16
w=16/-1
w=-16
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