How do I find the equivalent resistance of a circuit with a node between each resistor?
Keyword Y-Δ-transformation:

You can transform the Y-configuration at R3, R4, R5 into a Δ-configuration Ra, Rb, Rc and then see that there are three parallel configurations (R1 || Ra, R2 || Rb and R6 || Rc) which can be simplified.







simulate this circuit &ndash; Schematic created using CircuitLab