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9=w/7+8
We move all terms to the left:
9-(w/7+8)=0
We get rid of parentheses
-w/7-8+9=0
We multiply all the terms by the denominator
-w-8*7+9*7=0
We add all the numbers together, and all the variables
-1w+7=0
We move all terms containing w to the left, all other terms to the right
-w=-7
w=-7/-1
w=+7
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