3x - 3y + 2z = 7Â Â
3x + 1y - 3z = -5 ⇒ 6x - 2y - 1z = 2 ⇒ 42x - 14y -  7z = 14
7x - 1y - 2z = 0  ⇒ 7x - 1y - 2z = 0 ⇒ 42x -  6y - 12z = 0 Â
                                    -20y - 19z = 14
                                -20y + 20y - 19z = 14 + 20y
                                         -19z = 14 + 20y
                                          -19     -19
                                           z = -14/19 - 1 1/19y
                      3x - 3y + 2(-14/19 - 1 1/19y) = 7
                        3x - 3y - 1 9/19 - 2 2/19y = 7
                             3x - 5 2/19y - 1 9/19 = 7
                               +1 9/19 +1 9/19   Â
                                   3x - 5 2/19y = 8 9/19
                                3x - 3x - 5 2/19y = 8 9/19 - 3x
                                      -5 2/19y = 8 9/19 - 3xÂ
                                      -5 2/19    -5 2/19
                                            y = -1 64/97 + 57/97x
        3x - 3(-1 64/97 + 57/97x) + 2(-14/19 - 1 1/19y) = 7
           3x + 4 95/97 + 1 74/97x - 1 9/19 - 2 2/19y = 7
                4 74/97x - 2 2/19y + 3.5056972328 = 7
                                -3.5056972328  -3.5056972328
                              4 74/97x - 2 2/19y = 3.494302767
                      4 74/97x + 2 2/19y - 2 2/19y = 3.494302767 + 22/19y
                                      4 74/97x = 3.494302767 + 2 2/19
                                       4 74/97        4 74/97
                                 x = 0.7336523126 + 0.4420141262y
3(0.733652316 + 0.4420141262y) - 3(-1 64/97 + 57/97x) + 2(-14/19 - 1 1/19y)=7
      2.200956948 + 1.326042379y + 4 95/97 - 1 74/97x - 1 9/19 - 2 2/19y = 7               -1 74/97x - 0.7792207789y + 5.706654181 = 7
                                     -5.706654181   -5.70665418
                           -1 74/97x - 0.7792207789y = 1.293345820
(x, y, z) = (0.733652316 + 0.4420141262, -1 64/97 + 57/97x, -14/19 - 1 1/19y)