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12=w/3-3
We move all terms to the left:
12-(w/3-3)=0
We get rid of parentheses
-w/3+3+12=0
We multiply all the terms by the denominator
-w+3*3+12*3=0
We add all the numbers together, and all the variables
-1w+45=0
We move all terms containing w to the left, all other terms to the right
-w=-45
w=-45/-1
w=+45
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