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In an electrical circuits, the voltage, ...

In an electrical circuits, the voltage, E, in volts, the current, I, in amps, and the opposition to the flow of current, called impedance, Z, in ohms, are related by the equation, `E=IZ`. What is the impedance, in ohms, of an electrical circuit that has a current of (3+i) amps and a voltage of `(-7+i)` volts?

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