Help drawing equivalent resistor diagrams.

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When redrawing a resistor diagram after calculating an equivalent resistor, the equivalent resistor can be placed at any location between the original resistors, as long as its leads connect across the same nodes as R2. The orientation and position of the equivalent resistor do not affect the circuit's functionality. The critical factor is maintaining the correct connections in the circuit topology. Therefore, the equivalent resistor can be positioned where it visually makes the most sense to the user. Understanding that the physical layout is flexible helps in simplifying circuit diagrams effectively.
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Homework Statement


I really just need help understanding how to re-draw a resistor diagram after calculating an equivalent resistor.
Now in the picture given in the attachment, you can see that R1 and R6 are in series with each other
when I compute their equivalent resistor(R1+R6), on what location on the system of resistors would I place the equivalent resistor? Would I place it in the location of R1, R6, or some intermediate point in between? I know that no matter which of the three choices I pick, it'll still be in parallel with R2 but I'm just looking for clarity in the expected placement.

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You can place it anywhere, at any orientation you wish, so long as its leads connect across R2.

Orientation (angle, position) doesn't matter to a circuit. The lengths and convolutions of wires doesn't matter; they can wander all over the page at any angle or curve about with wild abandon. Only the underlying topology, in the mathematical sense, regarding what connects to what, matters.
 
Thank you!
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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