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-9+w=-9+7w
We move all terms to the left:
-9+w-(-9+7w)=0
We add all the numbers together, and all the variables
w-(7w-9)-9=0
We get rid of parentheses
w-7w+9-9=0
We add all the numbers together, and all the variables
-6w=0
w=0/-6
w=0
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