A =

    0.6273    0.8376    0.7165    0.7006    0.1146
         0    0.3716    0.5113    0.9827    0.6649
         0         0    0.7764    0.8066    0.3654
         0         0         0    0.7036    0.1400
         0         0         0         0    0.5668


b =

    0.8230
    0.6739
    0.9994
    0.9616
    0.0589


x =

    2.2578
   -1.7117
   -0.1601
    1.3461
    0.1039


ans =

  1.0e-015 *

    0.1110
   -0.1110
   -0.1110
         0
         0