Engineering How Do You Transform an Op Amp Circuit to Its Equivalent?

[Sinister]

Hey guys we're learning about op operational amps and I'm having a struggle on how to transform any given circuit with an amp into its equivilant. i understand all the math involved once the equiviliant has been found, just getting to that point is a bit confusing for me.
An example i found online that can someone can use to explain the process to me:

thanks!

 

[berkeman]

Hey guys we're learning about op operational amps and I'm having a struggle on how to transform any given circuit with an amp into its equivilant. i understand all the math involved once the equiviliant has been found, just getting to that point is a bit confusing for me.
An example i found online that can someone can use to explain the process to me:

thanks!

What do you mean by "transform"? Transform what to what?

Or do you just mean "how do you solve for the transfer function Vo/Vi"?