How to evaluate current in a circuit involving short circuit?

Question

I am trying to solve this homework question:

I got the short circuit in the middle by removing a voltage source. The problem is to find the current flowing through R6.

What I tried:

• Applying Star-Delta transformation on R3, R4 and R5 however it did not lead me anywhere.
• I also cannot seem to be able to apply mesh analysis as no voltages are supplied to me.
• I cannot convert the current source to a voltage source as there is no resistance in parallel with it.

Can someone please give me a hint as to how I should reduce this circuit?

Edit: Circuit after removing the short-circuited element R2:

Thanks to @Transistor and @MCG: I now was able to apply star-delta

Thanks to @Transistor and @MCG: I now was able to apply star-delta transformation which reduced the circuit to this:

I was able to solve this using current division.

P.S. The answer supplied by LTspice is 6 A for R6.

Answer 1

You've worked it out on your own. Congratulations. Here's how I would have approached it.

^{simulate this circuit – Schematic created using CircuitLab}

Figure 1. The original. Note that R2 is short-circuited. It can be removed.

^{simulate this circuit}

Figure 2. Note that R3 and R4 are in parallel.

^{simulate this circuit}

Figure 3. Now we can add the series resistances.

^{simulate this circuit}

Figure 4. This is as far as we need to go.

You can apply your current division here.