Write the problem in the standard form: -x1 - x₂ + 2x3 + x4 subject to → max 2x1 + x₂ + x3 + x4 ≥ 6 x₁ + 2x2 − 2x3 + x4 ≤ 4 X1, X2, X3, X4 ≥ 0.

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