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
End