4- Solve the following problem by the two-phase simplex method: x₁ + 3x₂-x3 2x₁ + x₂ + x3 ≥ 3 -x₂ + 5x₂ + x3 ≤ 4 -x₁ + x₂ ≥2 X1, X2, X3 20 Min s.t

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