////////////////////////////////////////////////////////////////
//
//     http://www.planetquantum.com/Solve/Level1/Den13/Page49.txt
//
////////////////////////////////////////////////////////////////

Generator:
(C (^ 5 1/2) _E 6 7 3)

Problem:
(= (cdot #[[223 606 797 749 978 969 640]
           [917 366 873 127 623 544 61]
           [835 961 152 572 427 89 724]
           [541 52 92 563 780 489 941]
           [441 440 837 878 227 496 950]
           [817 615 77 378 350 425 326]]
         #[[x_1] [x_2] [x_3] [x_4] [x_5] [x_6] [x_7]])
   #[[271] [828] [182] [845] [904] [523]])

Solution:
(= #[[x_1] [x_2] [x_3] [x_4] [x_5] [x_6] [x_7]]
   #[[-21705614400657807]
     [48890104743501384]
     [6511659879262812]
     [-168714568894474902]
     [-46377612190422575]
     [73366194582399408]
     [110399734198222414]])