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-2-8w=-7w+15
We move all terms to the left:
-2-8w-(-7w+15)=0
We get rid of parentheses
-8w+7w-15-2=0
We add all the numbers together, and all the variables
-1w-17=0
We move all terms containing w to the left, all other terms to the right
-w=17
w=17/-1
w=-17
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