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20-4(2w+1)=9w-4(9+2
We move all terms to the left:
20-4(2w+1)-(9w-4(9+2)=0
We add all the numbers together, and all the variables
-4(2w+1)-(9w-411+20=0
We multiply parentheses
-8w-(9w-411+20-4=0
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