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13w-20=9w+20
We move all terms to the left:
13w-20-(9w+20)=0
We get rid of parentheses
13w-9w-20-20=0
We add all the numbers together, and all the variables
4w-40=0
We move all terms containing w to the left, all other terms to the right
4w=40
w=40/4
w=10
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