I am having a problem with evaluating the integral so i put the question in it and i got a answer but i am not sure of his steps

$\displaystyle \int \frac{1}{x(1-x^{\frac{1}{4}})}$

http://www.wolframalpha.com/input/?i=integrate+dx%2F+(x(1-x^(1%2F4)))

I didnt understand how he substituted 'u' in the equation.