Question: Formulate the dual for: min. x 2 - x 3 + 2x 4 s.t. - x 1 + x 2 +2x 3 = 4 x

Formulate the dual for:

min. x2 - x3 + 2x4

s.t. - x1+ x2 +2x3 = 4

x1 +2x4 <= 20. (x1 +2x4 is less than or equal to 20)

x1 +x2 +2x3 - 2x4 = 6

x1, x2, x3, x4 >= 0 (x1, x2, x3, x4 are greater than or equal to 0)

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