If the equation $ x^{2}+a x+b c=0 $ and $ x^{2}+b x+c a=0 $ have only one common root $ \alpha(c \neq 0) $. $ \alpha $ is
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If the equation $ x^{2}+a x+b c=0 $ and $ x^{2}+b x+c a=0 $ have only one common root $ \alpha(c \neq 0) $. $ \alpha $ is