Consider the following linear program: max z = -2x1 + x2 – 4x3 +3x4 subject to x1 + x2 + 3x3 + 2x4 < 4 X1 – x3 + x4 >-1 2x1 + x2 < 2 ¤1 + 2x2 + x3 + 2x4 = 2 x2 2 0, x3 < 0, x4 > 0. Construct its dual problem.

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