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formulation and resolve the equations

Formulate the dual problem for the following LP. Solve in Lingo or Excel and provide the optimal values for the dual variables. Write the formulation and solution in below (here in the exam). Primal Problem Max z = 4 X1 + X2-2.5 X3 s.t. X1 + 2 X2 + 1.5 X3 IV 80 3 X1 + 1.5 X2 +1.5 X3 VI 150 X2 = = 40 X1, X2 > 0 X3 u.r.s. Dual Formulation: Dual variable optimal solutions