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28=w/4+9
We move all terms to the left:
28-(w/4+9)=0
We get rid of parentheses
-w/4-9+28=0
We multiply all the terms by the denominator
-w-9*4+28*4=0
We add all the numbers together, and all the variables
-1w+76=0
We move all terms containing w to the left, all other terms to the right
-w=-76
w=-76/-1
w=+76
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