y=2x2-10x, y=-x2+3x, 9-x2=0, -3x2=0, 2x2=0, 4x2+12x+9=0, x2+3x+9=0, -x2-3x-6=0, 2x2-5x-3=0, 3x2=2x+1, 9+ 4x2=0, 0,5x2-8x=0, 3-x2=0, -2x2-4x+6=0.

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