In a well-known cube network, each edge contains a 24 ohm resistor and

additional 12 ohm resistors along each face diagonal. These resistor are

only connected electrically at the corners of the cube. For the sake

readability, in the figure only some of these branches Without

resistors are shown. Find equivalent resistance between two terminals

connecting a face diagonal.

My try:

On solving this I am not getting the answer .

The answer is given as 7 ohm.