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Let beta be a real number .Consider the...

Let `beta ` be a real number .Consider the matrix
`A ={:((beta,0,1),(2,1,-2),(3,1,-2)):}`
If `A^(7) - (beta -1)A^(6) -betaA^(5)` is a singular , then the value of `9 beta ` is _______.

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