For a binary system, iterations can be performed by finding a new value of x₁^α_new from only the K-ratios as shown in Eqn. 14.5. For a ternary system, we need at least one composition. Derive the iteration formula, using x^α₃,old as the specified composition

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α *1, new α 1 – x3, old (K3, old — K2, old) – K2, old K₁, old-K2, old