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213=84-w
We move all terms to the left:
213-(84-w)=0
We add all the numbers together, and all the variables
-(-1w+84)+213=0
We get rid of parentheses
1w-84+213=0
We add all the numbers together, and all the variables
w+129=0
We move all terms containing w to the left, all other terms to the right
w=-129
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