////////////////////////////////////////////////////////////////
//
//     http://www.planetquantum.com/Solve/Level1/Den13/Page29.txt
//
////////////////////////////////////////////////////////////////

Generator:
(C (Cot 1) (Log 3) 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]])
   #[[109] [861] [228] [866] [810] [969]])

Solution:
(= #[[x_1] [x_2] [x_3] [x_4] [x_5] [x_6] [x_7]]
   #[[3108975291694269]
     [-918267640786014]
     [-1554773638562784]
     [-1913302907008740]
     [-1062662533084379]
     [1641586353430303]
     [4728769667201680]])