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15-w/9=28
We move all terms to the left:
15-w/9-(28)=0
We add all the numbers together, and all the variables
-w/9-13=0
We multiply all the terms by the denominator
-w-13*9=0
We add all the numbers together, and all the variables
-1w-117=0
We move all terms containing w to the left, all other terms to the right
-w=117
w=117/-1
w=-117
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