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x in (-oo:+oo)
2*x^2+(6/2)*x^2+8*x+7*x+5 = 0
5*x^2+15*x+5 = 0
DELTA = 15^2-(4*5*5)
DELTA = 125
DELTA > 0
x = (125^(1/2)-15)/(2*5) or x = (-125^(1/2)-15)/(2*5)
x = (5*5^(1/2)-15)/10 or x = (-5*5^(1/2)-15)/10
x in { (-5*5^(1/2)-15)/10, (5*5^(1/2)-15)/10 }
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