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9-w=-2w
We move all terms to the left:
9-w-(-2w)=0
We add all the numbers together, and all the variables
-1w-(-2w)+9=0
We get rid of parentheses
-1w+2w+9=0
We add all the numbers together, and all the variables
w+9=0
We move all terms containing w to the left, all other terms to the right
w=-9
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