If $\alpha$, $\beta$ and $\gamma$ are the roots of the equation ${ x }^{ 3 }-x-1=0$, then $\dfrac { 1+\alpha }{ 1-\alpha } +\dfrac { 1+\beta }{ 1-\beta } +\dfrac { 1+\gamma }{ 1-\gamma }$ has the value

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