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Maximize x1 + 2 x2 - 0.1 x3 -3 x4 Subject To x1 + x2 <= 5 2 x1 - x2 >= 0 -x1 + 3 x2 >= 0 x3 + x4 >= .5 Bounds x3 >= 1.1 x3 <= 10 Semi-continuous x3 General x3 End