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166=85-w
We move all terms to the left:
166-(85-w)=0
We add all the numbers together, and all the variables
-(-1w+85)+166=0
We get rid of parentheses
1w-85+166=0
We add all the numbers together, and all the variables
w+81=0
We move all terms containing w to the left, all other terms to the right
w=-81
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