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-3+9w=5w-7
We move all terms to the left:
-3+9w-(5w-7)=0
We get rid of parentheses
9w-5w+7-3=0
We add all the numbers together, and all the variables
4w+4=0
We move all terms containing w to the left, all other terms to the right
4w=-4
w=-4/4
w=-1
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