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$\large { (7+4\sqrt { 3 } ) }^{ { x }^{ 2 }-5x+5 }+{ (7-4\sqrt { 3 } ) }^{ { x }^{ 2 }-5x+5 }=14$

Suppose a 4-digit number $\overline{ABCD}$ with $A<B<C<D$ and all its 4 digits satisfy the equation above.

Determine the value of $\overline{ABCD}$.

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