Crazynomials??

Algebra Level 2

The value of (xa)3+(xb)3+(xc)33(xa)(xb)(xc){ (x-a) }^{ 3 }+{ (x-b) }^{ 3 }+{ (x-c) }^{ 3 }-3(x-a)(x-b)(x-c) when a+b+c=3xa+b+c=3x is :

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