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