$$\left. \begin{array} { l } { x + y + z = 25 } \\ { \begin{array} { l } { ( z - x ) ^ { 3 } + ( z - y ) ^ { 3 } + 3 ( z - x ) ( z - y ) = ? } \\ { x ^ { 3 \right.$$
$x=25-z-y$
$$x+z=25-y$$
$$x=25-y-z$$
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