Question: solve for a function in Maple

I got I variable in Maple defined as   e := ((w-b)/b)^lambda;

I know that     prof := f(e)-w*L;     where f(e) is some unknown function   and that    isolate(diff(prof, w) = 0, w) = -b/(lambda-1);

How can I find the expression for f(e) ?

 

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