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9w=21+2w
We move all terms to the left:
9w-(21+2w)=0
We add all the numbers together, and all the variables
9w-(2w+21)=0
We get rid of parentheses
9w-2w-21=0
We add all the numbers together, and all the variables
7w-21=0
We move all terms containing w to the left, all other terms to the right
7w=21
w=21/7
w=3
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