Fit a logperiodic function to data set in flex

Question

I wahnt to fit a function to a data set.
The function formula looks like this:
http://docs.google.com/fileview?id=0B_6wV4xlS6wCNTA2MzU2MTMtMWMwZC00NzNjLTg1MjktYzc4MzFkOTk5YzJh&hl=en"

I fited the power function following this advice: stackoverflow.com/questions/2984164/power-function-fit-to-data-set.

I've done it like here:
mathworld.wolfram.com/LeastSquaresFittingPowerLaw.html.

The next step is: fit the whole function with least squares fitting procedure. And I came to this:
http://docs.google.com/fileview?id=0B_6wV4xlS6wCYTkwOTljYmQtMzljNC00MzkyLTk0NTgtODE4Y2QzZmQ3MzIy&hl=en.

But it's a non linear equation system.

How to solve the equation system in flex?