Bas x1  x2  x3  x4  x5  x6  x7  b
x4  3   4   1.5 1               100
x5  19  12  13      1           1000
x6  8   10  9           1       500
x7  2   3   1.9             1   75
F   -7  -9  -5  0   0   0   0   0


Bas x1      x2  x3      x4     x5   x6  x7  b
x2  0.75    1   0.375   0.25    0   0   0   25
x5  10      0   8.5     -3      1   0   0   700
x6  0.5     0   5.25    -2.5    0   1   0   250
x7  -0.25   0   0.775   -0.75   0   0   1   0
F   -0.25   0   -1.625  2.25    0   0   0   225



Basis   x1         x2   x3      x4         x5   x6      x7          b
x2  0.870967741935  1   0   0.612903225806  0   0   -0.483870967742 25
x5  12.7419354839   0   0   5.22580645161   1   0   -10.9677419355  700
x6  2.1935483871    0   0   2.58064516129   0   1   -6.77419354839  250
x3  -0.322580645161 0   1   -0.967741935484 0   0   1.29032258065   0
F   -0.774193548387 0   0   0.677419354839  0   0   2.09677419355   225

Bas x1    x2    x3   x4    x5   x6    x7        b
x1  1   1.148   0   0.704   0   0   -0.556  28.703703
x5  0   -14.630 0   -3.740  1   0   -3.889  334.259
x6  0   -2.519  0   1.037   0   1   -5.556  187.037
x3  0   0.370   1   -0.7407 0   0   1.111   9.259259
F   0   0.888   0   1.2222  0   0   1.667   247.222