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-105=90w-84
We move all terms to the left:
-105-(90w-84)=0
We get rid of parentheses
-90w+84-105=0
We add all the numbers together, and all the variables
-90w-21=0
We move all terms containing w to the left, all other terms to the right
-90w=21
w=21/-90
w=-7/30
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