Which of the following equations yields to a non - degenerate conic? A 3x2 + 3y² - 12x+ 12y-6=0 9x2 – 4y? + 18x – 16y-7=0 x2 + 3y2 - 4x +24y+52 =0 3x² + 5y? - 6x - 20y+28=0

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