-x - y + z = 2; 3x – y – z = 0; 2x + y – 3z = 2 2x – 4y + z = 3; &x – 2y + 4z = 7; –4x + y – 2z = -14 3x + 2y – z = 6; -2x + 2y + z = 3; x + y + z = 4 2x + y – 3z = 0; 4x + 2y – 6z = 0; x – y + z = 0

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