a=1 b=3 c= 7 - x2 + 3x +7 = 0, a=2 b=1 c=7 - 2x2 + x +7 = 0, a=1 b=-3 c=7 - x2 - 3x +7 = 0, a=1 b=-8 c=-10 - x2 - 8x = 10, a=1 b=-8 c=10 - x2 - 8x = -10, a=1 b=-5 c=0 - x2 = 5x, a=1 b=5 c=0 - x2 = -5x, a=-1 b=3 c=-10 - -x2 + 3x - 6 = 4, a=-1 b=3 c=-2 - -x2 + 3x - 6 = -4, a=6 b=0 c=0 - 7x2 = x2,

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