min: + 4.1 x1 + 4.3 x2 + 5.8 x3 + 6.0 x4 + 7.6 x5 + 7.5 x6 + 7.3 x7 + 6.9 x8 + 7.3 x9 ;
  + 1.0 x1 + 1.0 x2 + 1.0 x3 + 1.0 x4 + 1.0 x5 + 1.0 x6 + 1.0 x7 + 1.0 x8 + 1.0  x9 = 1.0 ;
  + 0.2 x1 + 0.5 x2 + 0.3 x3 + 0.3 x4 + 0.3 x5 + 0.6 x6 + 0.4 x7 + 0.1 x8 + 0.1  x9 = 0.3 ;
  + 0.3 x1 + 0.4 x2 + 0.2 x3 + 0.4 x4 + 0.3 x5 + 0.3 x6 + 0.5 x7 + 0.3 x8 + 0.1  x9 = 0.3 ;
  + 0.5 x1 + 0.1 x2 + 0.5 x3 + 0.3 x4 + 0.4 x5 + 0.1 x6 + 0.1 x7 + 0.6 x8 + 0.8  x9 = 0.4 ;