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21=3-9w
We move all terms to the left:
21-(3-9w)=0
We add all the numbers together, and all the variables
-(-9w+3)+21=0
We get rid of parentheses
9w-3+21=0
We add all the numbers together, and all the variables
9w+18=0
We move all terms containing w to the left, all other terms to the right
9w=-18
w=-18/9
w=-2
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