////////////////////////////////////////////////////////////////
//
//     http://www.planetquantum.com/Solve/Level1/Den13/Page17.txt
//
////////////////////////////////////////////////////////////////

Generator:
(C (Sec 1) (^ _Pi 1/2) 7 8 2)

Problem:
(= (cdot #[[18 50 81 57 17 68 9 25]
           [61 79 11 75 32 41 39 86]
           [50 19 34 70 39 66 55 9]
           [40 9 29 88 35 15 82 77]
           [85 88 15 41 12 61 59 67]
           [5 92 18 41 41 32 87 30]
           [66 71 14 91 3 51 15 80]]
         #[[x_1] [x_2] [x_3] [x_4] [x_5] [x_6] [x_7] [x_8]])
   #[[17] [72] [45] [38] [50] [90] [55]])

Solution:
(= #[[x_1] [x_2] [x_3] [x_4] [x_5] [x_6] [x_7] [x_8]]
   #[[-2498469001592]
     [-1359316404298]
     [-1756001599347]
     [-992034337675]
     [-252169203382]
     [3775995267839]
     [370741769883]
     [2236114854146]])