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20+w=-20+9w-13w
We move all terms to the left:
20+w-(-20+9w-13w)=0
We add all the numbers together, and all the variables
w-(-4w-20)+20=0
We get rid of parentheses
w+4w+20+20=0
We add all the numbers together, and all the variables
5w+40=0
We move all terms containing w to the left, all other terms to the right
5w=-40
w=-40/5
w=-8
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