If the equations \( x^{2}+x+a=0 \) and \( x^{2}+a x+1=0, a \neq 1 \), have a common root, then \...

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If the equations \( x^{2}+x+a=0 \) and \( x^{2}+a x+1=0, a \neq 1 \), have a common root, then \( a= \)
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