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20=0.5w
We move all terms to the left:
20-(0.5w)=0
We add all the numbers together, and all the variables
-(+0.5w)+20=0
We get rid of parentheses
-0.5w+20=0
We move all terms containing w to the left, all other terms to the right
-0.5w=-20
w=-20/-0.5
w=+40
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