Two of the roots of the equation $(\lambda -2)(x^2+x+1)^2-(\lambda+2)(x^4+x^2+1)=0$ are equal, then the value(s) of $'\lambda'$ is/are
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Two of the roots of the equation $(\lambda -2)(x^2+x+1)^2-(\lambda+2)(x^4+x^2+1)=0$ are equal, then the value(s) of $'\lambda'$ is/are