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72=w-4+w
We move all terms to the left:
72-(w-4+w)=0
We add all the numbers together, and all the variables
-(2w-4)+72=0
We get rid of parentheses
-2w+4+72=0
We add all the numbers together, and all the variables
-2w+76=0
We move all terms containing w to the left, all other terms to the right
-2w=-76
w=-76/-2
w=+38
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