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Let P be the image of the point (3, 1, 7) with respect to the plane x – y + z = 3. Then the equation of the plane passing through P and containing the straight line 1 z 2 y 1 x = = is

x + y – 3z = 0
3x + z = 0
x – 4y + 7z = 0
2x – y = 0

Correct answer: x – 4y + 7z = 0

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