Question: How do I solve doublle exponential problem?

How do I solve double exponential problem of the form  : 

 i = kc* ip *( e -a1*t - e -a2*t ) given that for d/dt (i) =0. tp = ( i/(a2 -a1)) *ln(a2/a1) and                                

kc = 1/(e -a1 *tp - e -a2*tp)

 

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