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7w-20=3w+4
We move all terms to the left:
7w-20-(3w+4)=0
We get rid of parentheses
7w-3w-4-20=0
We add all the numbers together, and all the variables
4w-24=0
We move all terms containing w to the left, all other terms to the right
4w=24
w=24/4
w=6
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