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9=w/4-12
We move all terms to the left:
9-(w/4-12)=0
We get rid of parentheses
-w/4+12+9=0
We multiply all the terms by the denominator
-w+12*4+9*4=0
We add all the numbers together, and all the variables
-1w+84=0
We move all terms containing w to the left, all other terms to the right
-w=-84
w=-84/-1
w=+84
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