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(1/R1 + 1/R4) * V1 - V2/R1 - V3/R4 = - 1.4 Id
(1/R1 + 1/R2 + 1/R3) * V2 - V1/R1 - V3/R3 = 0
(1/R3 + 1/R4 + 1/R5) * V3 - V1/R4 - V2/R3 = - Us/R5
Id = (V3 - V1)/R4
U0 = V1
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