Let ${ z }_{ 1 },{ z }_{ 2 },{ z }_{ 3 }$ are the roots of ${ x }^{ 3 }+3a{ x }^{ 2 }+3bx+c=0$ in which $a,b,c$ are complex numbers, corresponds to the points A,B,C on the complex plane. The triangle $ABC$ is an equilateral triangle if,

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