Pole Identification Using Block Diagram Reduction

[Hraabo]

Hello I hope someone can help me, as i am kinda stuck for the moment.
As you can see, the assignment states that I need to find the poles from the closed loop transfer function.

I plan on doing so, by using block diagram reduction method.

This is as fare as I've come, and can't come further, even though I am pretty sure that it is possible. The summation point confuses me, how do I remove it? I could remove the feedback loop, but the summation point would still be there, or am I wrong?

Any help would be nice.

 

[WWGD]

@Hraabo,
There is a section here specially for EE. It may be better to post it there.

 

[Hraabo]

Is that so? Maybe Someone Can Move the post then?

And Sorry for the trouble

 

[WWGD]

No problem, I told a mentor, he should be having a look at it soon.

 

[Hraabo]

Bump - No help? :S