////////////////////////////////////////////////////////////////
//
//     http://www.planetquantum.com/Solve/Level1/Den13/Page42.txt
//
////////////////////////////////////////////////////////////////

Generator:
(C (Log 7) (^ _E 1/2) 7 8 2)

Problem:
(= (cdot #[[19 45 91 1 49 5 53 13]
           [30 51 5 35 27 43 44 31]
           [79 72 96 37 8 47 29 58]
           [18 61 18 84 59 39 1 49]
           [93 75 79 86 27 52 6 92]
           [67 78 76 58 49 85 87 87]
           [15 26 99 30 61 69 42 5]]
         #[[x_1] [x_2] [x_3] [x_4] [x_5] [x_6] [x_7] [x_8]])
   #[[16] [48] [72] [12] [70] [70] [1]])

Solution:
(= #[[x_1] [x_2] [x_3] [x_4] [x_5] [x_6] [x_7] [x_8]]
   #[[58226220397]
     [44615722237]
     [-55066498368]
     [-240420976023]
     [166907556722]
     [87661626577]
     [-143747600357]
     [87639311229]])