systems of equations (3 variables)
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x - 3y + 2z = 15 3x + y + 9z = 43 -x + 4y + z = 1
(-3, -2, 6)
x + y + z = 3 2x + 2y - z = -9 x + 3y - 4z = -26
(0, -2, 5)
x + y + z = 6 2x - y + 2z = 3 x + 4y - z = 11
(1, 3, 2)
2x + 2y + z = 23 x - 2y - 2z = 5 -x - 2y + 3z = 8
(11, -2, 5)
x + y + z = -1 4x - y + 2z = -8 x + 7y - z = 39
(3, 4, -8)
