Answer to Question #23767 in Electric Circuits for Rachel Hummel
1/151[Ω] + 1/R[Ω] = 1/128[Ω] ==>
R[Ω] = 1/(1/128[Ω] - 1/151[Ω]) = 19328/23 Ω (≈ 840.34 Ω).
So, 19328/23 Ω resistor must be placed in parallel with a 151 Ω resistor to make the equivalent resistance 128 Ω.
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