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5w-20=20+7w-4w
We move all terms to the left:
5w-20-(20+7w-4w)=0
We add all the numbers together, and all the variables
5w-(3w+20)-20=0
We get rid of parentheses
5w-3w-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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