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    Finding voltages at opamp terminals from circuits

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    FIGURE 1 shows two amplifier circuits, each of which has one unknown
    voltage (shown highlighted).Assume that
    the op-amps are ideal and that the magnitude of their output voltages is
    less than their maximum peak output voltage swing (VOM).

    See attached.

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    Solution Summary

    This solution shows how one can determine the input potentials at opamp terminals by considering Ideal OpAmp conditions and circuit topology, including kirchoffs current law, potential divider law and virtual earths