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-20-19w=20-17w
We move all terms to the left:
-20-19w-(20-17w)=0
We add all the numbers together, and all the variables
-19w-(-17w+20)-20=0
We get rid of parentheses
-19w+17w-20-20=0
We add all the numbers together, and all the variables
-2w-40=0
We move all terms containing w to the left, all other terms to the right
-2w=40
w=40/-2
w=-20
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