Cubes and cubes

Algebra Level 3

\[\large (x^{2}+x-2)^{3}+(2x^{2}-x-1)^{3}=27 (x^{2}-1)^3\]

If the four distinct real roots to the equation above are \(a\), \(b\), \(c\) and \(d\), find \(-(a+b+c+d)\).

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