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x1= -3/2; x2=4/3

75x^2+35x-10=0

x1=-6/5; x2=1/3

x^2+6x+3=0

6x^2-x=2

15x^2-6=-13x

x1=-2/3; x2=1/5

12x^2+60x+75=0

x1=-5/2

x1=-0.5; x2=2/3

6x^2+x-12=0

x1=-5.5 x2=-0.55