MAXIMIZE
obj: + x1 + 2 x2 + 3 x3 + x4
SUBJECT TO
c1: - x1 + x2 + x3 + 10 x4 <= 20
c2: + x1 - 3 x2 + x3 <= 30
c3: + x2 - 3.5 x4 = 0
BOUNDS
2 <= x4 <= 3
0 <= x1 <= 40
0 <= x2 <= +inf
0 <= x3 <= +inf
GENERALS
x4
END