lf every pair from among the equations $x^{2}+ax+bc=0,\ x^{2}+bx+ca= 0$ and $x^{2}+cx+ab=0$ has common root, then the sum of the three common roots is
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lf every pair from among the equations $x^{2}+ax+bc=0,\ x^{2}+bx+ca= 0$ and $x^{2}+cx+ab=0$ has common root, then the sum of the three common roots is