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If x 2 – y 2 + 2hxy + 2gx + 2fy + c = 0 is the locus of a point, which moves such that it is always equidistant from the lines x + 2y + 7 = 0 and 2x – y + 8 = 0, then the value of g + c + h – f equals

1. 29
2. 8
3. 14
4. 6

Correct answer: 14

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