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If the equation ax^2 + 2hxy + by^2 + 25x...

If the equation `ax^2 + 2hxy + by^2 + 25x + 2fy + c = 0,` represents a pair of straight lines, prove that the third pair of straight lines (excluding `xy = 0`) passing through the points where these meet the axes is` ax^2 – 2hxy + by^2 +2gx + 2fy + c+(4fg)/c. xy=0`

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