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x^2+10x+21=0

2x^2-7x+3=0

x^2+17x+30=0

x^2-4x+2=0

x^2+2x-3=0

x^2+5x+6=0

2x^2-5x+3=0

4x^2+6x+2=0

x=2 y x=3

x=1 y X=-3

x=-15 y x=-2

x=-7 y x=-3

x=-1 y x=-1/2

x=3 y x=1/2

x=3/2 y x=1

x=√2+2 y x=-√2+2