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복소수 x,y,z,w 가 다음 조건을 만족시킨다.

[조건]
(가) x+y+z+w = 4
(나) xy+xz+xw+yz+yw+zw = -1
(다) xyz+xyw+xzw+yzw = 3
(라) xyzw = -1

x^3 + y^3 + z^3 + w^3 의 값은?
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