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253=78-w
We move all terms to the left:
253-(78-w)=0
We add all the numbers together, and all the variables
-(-1w+78)+253=0
We get rid of parentheses
1w-78+253=0
We add all the numbers together, and all the variables
w+175=0
We move all terms containing w to the left, all other terms to the right
w=-175
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