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I just wanted to ask you if I redrew the circuit correctly and if you could help me what to calculate first or if you could help me to redraw this circuit even simpler. And to tell me a few tips for knowing if resistors are in parallel or series.
You are correct. A simpler answer is shown bellow, which is closer to the given question.
simulate this circuit – Schematic created using CircuitLab
For R1, pivot on B and pull rest of circuit to straighten out R1.
Pivot on D to straighten out R3.