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