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If the system of linear equations x – 4y + 7z = g 3y – 5z = h –2x + 5y – 9z = k is consistent, then :

1. g + 2h + k = 0
2. g + h + 2k = 0
3. g + h + k = 0
4. 2g + h + k = 0

Correct answer: 2g + h + k = 0

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