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-7-9w=-8w
We move all terms to the left:
-7-9w-(-8w)=0
We get rid of parentheses
-9w+8w-7=0
We add all the numbers together, and all the variables
-1w-7=0
We move all terms containing w to the left, all other terms to the right
-w=7
w=7/-1
w=-7
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