Question 67609
x - x^2/3 = x^1/3 (??) 
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You are factoring out x^(1/3)
You start with x(3/3)-x^(2/3)
Youf factor out x^(1/3) and get:
(x^(1/3))(x^(2/3)-x^(1/3)
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So your ?? is (x^(2/3)-x^(1/3))
Cheers,
Stan H.