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72=6w+3w
We move all terms to the left:
72-(6w+3w)=0
We add all the numbers together, and all the variables
-(+9w)+72=0
We get rid of parentheses
-9w+72=0
We move all terms containing w to the left, all other terms to the right
-9w=-72
w=-72/-9
w=+8
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