1.
- x + 7y - 4z = -9
2.
- 9x + 2y - 2z = -81
3.
- 4x + 7y - z = -8
4.
- 4x - 6y - 6z = -82
5.
4x + y - 4z = 11
6.
8x + 8y - 9z = 11
7.
- 6x + y - 4z = -64
8.
- 2x - y - 7z = -19
9.
8x - 9y + 5z = 49
10.
9x - 2y - 3z = 3
11.
2x + 2y - 6z = -24
12.
6x + y - 3z = 15
13.
- 2x + 9y + 7z = 96
14.
- 6x + 7y + 2z = 43
15.
- 8x - 3y - 7z = -75
16.
x + 6y + 8z = 31
17.
4x - 6y + 6z = 0
18.
- 5x - 2y - 2z = -51
19.
- x - 3y + 3z = -6
20.
- 5x - 5y - 2z = -91