In matrix equation [A] \{X\}=\{R\}. [A]=[\table 4 , 8 , 4 ; 8 , 16 , -4 ; 4 , -4 , 15],\{X\}=\{\table 2 ; 1 ; 4\} and \{R\}=\{\table 32 ; 16 ; 64\} One of the eigenvalues of matrix [A] is

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