Question: Yet another substitution problem

I tried the following:

 

k1 := -(ln(q/(-1+q+exp(phi)))+phi)/phi;
                                    
eqn1 := (1-q)/q = mu;
                         
solve(%,q);
                             
subs(q=%,k1);

 

...but didn´t function. Maple just reprints k1, without including mu.

What did I do wrong?

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