A = [14   -22   -26    -2   -77   100   -90
     26    25   -15   -63    33    92    14
    -53    40    19    40   -27   -88    40
     10   -21    13    97   -72   -28    92
     86   -17    43    61    13    10    50
    -33    31     2    41    65   -48    48
     31    68    55    -3    35    19   -14]

x = [ 2.7
      6.1
     -8.3
      8.9
      8.3
      2.0
     -4.9]

