\ENCODING=ISO-8859-1 \Problem name: IloCplex Maximize obj: x1 + 2 x2 + 3 x3 + x4 + [ - 33 x1 ^2 + 12 x1 * x2 - 22 x2 ^2 + 23 x2 * x3 - 11 x3 ^2 ] / 2 Subject To c1: - x1 + x2 + x3 + 10 x4 <= 20 c2: x1 - 3 x2 + x3 <= 30 c3: x2 - 3.5 x4 = 0 Bounds 0 <= x1 <= 40 0 <= x4 <= 3 Generals x4 End