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maximize obj: x1 + 6.4e-01 x2 subject to c1: 5e+01 x1 + 3.1e+01 x2 <= 2.5e+02 c2: 3e+00 x1 - 2e+00 x2 >= -4e+00 bounds 0 <= x1 <= +infinity 0 <= x2 <= +infinity general x1 x2 end