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is't like 10kΩ || (10kµ+diodeΩ) -- where the first 10k & 5k likely can be considered as "primary voltage divider" and
the second 10k and the (BW or FW)diode as the secondary voltage divider for voltage drop on the first 10k ... PS! the foreward diode is usually some 2k55 ohms (i donno for this circuit . . . the LT Spice shows so at 5V total supply for 1N4148)