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8.5=w-12
We move all terms to the left:
8.5-(w-12)=0
We get rid of parentheses
-w+12+8.5=0
We add all the numbers together, and all the variables
-1w+20.5=0
We move all terms containing w to the left, all other terms to the right
-w=-20.5
w=-20.5/-1
w=20+0.5/1
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