Question: function equation

Hi all forum people, I need use the maple for symbolic solutions, I am a beginner user.

I read about the isolate, solve, equations, expressions and functions in maple, I have a great confusion in my head.

My needs are, make a equations (with currents and voltages) and isolate any variable in a time, and combine them with another equations.

  ic=vin/L*Ton+im

if=(vin-vo)/L*Toff+im

dil/dt=(if-im)/T

another case:

v=L*(iM-im)/Ton

I need isolate im in the last equation 

this is a sample that i need.

My question is. where I make this in maple?

 

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