////////////////////////////////////////////////////////////////
//
//     http://www.planetquantum.com/Solve/Level1/Den13/Page33.txt
//
////////////////////////////////////////////////////////////////

Generator:
(C (Cot 1) (Log 7) 6 7 3)

Problem:
(= (cdot #[[642 92 615 934 330 703 6]
           [419 986 594 265 620 230 278]
           [113 918 171 379 101 162 280]
           [426 276 856 839 164 672 198]
           [482 919 760 196 804 658 143]
           [65 960 471 415 739 183 569]]
         #[[x_1] [x_2] [x_3] [x_4] [x_5] [x_6] [x_7]])
   #[[194] [591] [14] [905] [531] [330]])

Solution:
(= #[[x_1] [x_2] [x_3] [x_4] [x_5] [x_6] [x_7]]
   #[[13006384182545200]
     [-3841568554877018]
     [-6504388540515249]
     [-8004294126305131]
     [-4445643938894080]
     [6867569143626883]
     [19782786684314265]])