If 4 is one solution of the equation x2 – x + k = 15, where k is a constant, what is the other solution?

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<img alt='Images' src='https://www.fatskills.com/images3/gmat/e0367-02.jpg'><br>If 4 is one solution of the equation <em>x</em><sup>2</sup> – <em>x</em> + <em>k</em> = 15, where <em>k</em> is a constant, what is the other solution?