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Hi guys, I'm stuck with determining how will I solve this circuit using Thevenin's and Norton's Theorem.

Using KVL on the four loops, I will get:

7I

13I

-15I

7I

and here I don't know what's next.

Our professor gave this problem without teaching the principles of Thevenin and Norton's Theorem. So a short discussion while solving the problem is much appreciated. Thank you. ^^

**Given Problem**: From the circuit (which is in the image), find the voltage across a 6-ohm resistor using Thevenin's Theorem and Norton's Theorem.**The attempt at a solution**Using KVL on the four loops, I will get:

7I

_{a}- 6I_{b}= 12 ---- Equation 113I

_{b}- 3I_{c}= 3 ---- Equation 2-15I

_{c}+ 7I_{d}= 3 ---- Equation 37I

_{c}- 9I_{d}= 9 ---- Equation 4and here I don't know what's next.

Our professor gave this problem without teaching the principles of Thevenin and Norton's Theorem. So a short discussion while solving the problem is much appreciated. Thank you. ^^