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8+7w=-9-10w
We move all terms to the left:
8+7w-(-9-10w)=0
We add all the numbers together, and all the variables
7w-(-10w-9)+8=0
We get rid of parentheses
7w+10w+9+8=0
We add all the numbers together, and all the variables
17w+17=0
We move all terms containing w to the left, all other terms to the right
17w=-17
w=-17/17
w=-1
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