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21=246-w
We move all terms to the left:
21-(246-w)=0
We add all the numbers together, and all the variables
-(-1w+246)+21=0
We get rid of parentheses
1w-246+21=0
We add all the numbers together, and all the variables
w-225=0
We move all terms containing w to the left, all other terms to the right
w=225
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