Hello! I've got this circuit:

I need to apply Thevenin's theorem on A B nodes, so far I am having hard time simplifying it to calculate Rth.

Here is photo with what I did. 8 is R6+R7. Can someone give me a clue on how to proceed?

Mod: Posted photo.

I need to apply Thevenin's theorem on A B nodes, so far I am having hard time simplifying it to calculate Rth.

Here is photo with what I did. 8 is R6+R7. Can someone give me a clue on how to proceed?

Mod: Posted photo.

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