matrix M=
     3.4     2.98    -1.65 
   -1.06     4.12     2.68 
    2.83    -3.02    -2.22 
right hand side b=
    0.27   -0.113    0.644 
solution x to Mx=b :
  -0.242    0.596    0.609 
check:  Mx= (should be equal b)
    0.27   -0.113    0.644