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-42=4w-18
We move all terms to the left:
-42-(4w-18)=0
We get rid of parentheses
-4w+18-42=0
We add all the numbers together, and all the variables
-4w-24=0
We move all terms containing w to the left, all other terms to the right
-4w=24
w=24/-4
w=-6
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