Evaluate (complex solution)
\beta -\alpha =\gamma -\beta \text{ and }\gamma -\beta =\delta -\gamma
Solve for δ
\delta =\frac{3\gamma -\alpha }{2}
\beta =\frac{\alpha +\gamma }{2}
Solve for γ
\gamma =\frac{\alpha +2\delta }{3}
\beta =\frac{2\alpha +\delta }{3}
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