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20-10w=-9w-18+w
We move all terms to the left:
20-10w-(-9w-18+w)=0
We add all the numbers together, and all the variables
-10w-(-8w-18)+20=0
We get rid of parentheses
-10w+8w+18+20=0
We add all the numbers together, and all the variables
-2w+38=0
We move all terms containing w to the left, all other terms to the right
-2w=-38
w=-38/-2
w=+19
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