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42=50-w
We move all terms to the left:
42-(50-w)=0
We add all the numbers together, and all the variables
-(-1w+50)+42=0
We get rid of parentheses
1w-50+42=0
We add all the numbers together, and all the variables
w-8=0
We move all terms containing w to the left, all other terms to the right
w=8
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