Question: inverting a function with Maple 9.5

Hello everyone,

Can anyone describe me how to invert a function in Maple 9.5? The following, in particular:

piecewise(x<=20, 100-x-(3/80)*x^2+(3/1600)*x^3-2*x, x>=20 and x<=fsolve(1495/16-(201/64)*x+(33/1280)*x^2-(3/25600)*x^3=0), 1495/16-(201/64)*x+(33/1280)*x^2-(3/25600)*x^3)

Thank you in advance.

Ozgur

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