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72=12-4w
We move all terms to the left:
72-(12-4w)=0
We add all the numbers together, and all the variables
-(-4w+12)+72=0
We get rid of parentheses
4w-12+72=0
We add all the numbers together, and all the variables
4w+60=0
We move all terms containing w to the left, all other terms to the right
4w=-60
w=-60/4
w=-15
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