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9+3w=-9+w
We move all terms to the left:
9+3w-(-9+w)=0
We add all the numbers together, and all the variables
3w-(w-9)+9=0
We get rid of parentheses
3w-w+9+9=0
We add all the numbers together, and all the variables
2w+18=0
We move all terms containing w to the left, all other terms to the right
2w=-18
w=-18/2
w=-9
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