How to construct the dual of the problem, Operation Management

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Construct the dual of the problem

minimize Z=3(x1) - 2(x2) + 4(x3), subject to the constraints

3(x1) + 5(x2) + 4(x3) >= 7,

6(x1) + (x2) + 3(x3) >= 4,

7(x1) - 2(x2) - (x3) <= 10,

(x1) - 2(x2) + 5(x3) >= 3,

4(x1) + 7(x2) - 2(x3) >= 2,

(x1),(x2),(x3) >= 0

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