2 Equations, 1 Variable. Still Unsolvable?

Algebra Level 3

{x3+2x2+2x+1=0x2015+x2014+1=0\begin{cases} x^3+2x^2+2x+1=0 \\ x^{2015}+x^{2014}+1=0 \end{cases} Find the sum of all possible values of xx, which satisfy the above equations simultaneously.

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