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20=w/5-9
We move all terms to the left:
20-(w/5-9)=0
We get rid of parentheses
-w/5+9+20=0
We multiply all the terms by the denominator
-w+9*5+20*5=0
We add all the numbers together, and all the variables
-1w+145=0
We move all terms containing w to the left, all other terms to the right
-w=-145
w=-145/-1
w=+145
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