Real values!

Algebra Level 5

Find the value of \(-a\) for which the roots \(x_{1}, x_{2}, x_{3}\) of \(x^{ 3 }-6x^{2}+ax-a = 0\) satisfy \(\left( x_{1}-3 \right)^{3}+\left(x_{2}-3 \right)^{3}+\left(x_{3}-3 \right)^{ 3 } = 0\).

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