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-w/4=42
We move all terms to the left:
-w/4-(42)=0
We multiply all the terms by the denominator
-w-42*4=0
We add all the numbers together, and all the variables
-1w-168=0
We move all terms containing w to the left, all other terms to the right
-w=168
w=168/-1
w=-168
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