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155=20-w
We move all terms to the left:
155-(20-w)=0
We add all the numbers together, and all the variables
-(-1w+20)+155=0
We get rid of parentheses
1w-20+155=0
We add all the numbers together, and all the variables
w+135=0
We move all terms containing w to the left, all other terms to the right
w=-135
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