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