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54=w+8w
We move all terms to the left:
54-(w+8w)=0
We add all the numbers together, and all the variables
-(+9w)+54=0
We get rid of parentheses
-9w+54=0
We move all terms containing w to the left, all other terms to the right
-9w=-54
w=-54/-9
w=+6
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