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199=21-w
We move all terms to the left:
199-(21-w)=0
We add all the numbers together, and all the variables
-(-1w+21)+199=0
We get rid of parentheses
1w-21+199=0
We add all the numbers together, and all the variables
w+178=0
We move all terms containing w to the left, all other terms to the right
w=-178
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