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4w+(3w-21)=427
We move all terms to the left:
4w+(3w-21)-(427)=0
We get rid of parentheses
4w+3w-21-427=0
We add all the numbers together, and all the variables
7w-448=0
We move all terms containing w to the left, all other terms to the right
7w=448
w=448/7
w=64
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