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12=w/9
We move all terms to the left:
12-(w/9)=0
We add all the numbers together, and all the variables
-(+w/9)+12=0
We get rid of parentheses
-w/9+12=0
We multiply all the terms by the denominator
-w+12*9=0
We add all the numbers together, and all the variables
-1w+108=0
We move all terms containing w to the left, all other terms to the right
-w=-108
w=-108/-1
w=+108
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