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6*x^2-((10/4)*x^2)-(11*x)-(4*x)-15 = 0
6*x^2+(-5/2)*x^2-11*x-4*x-15 = 0
7/2*x^2-15*x-15 = 0
DELTA = (-15)^2-(-15*7/2*4)
DELTA = 435
DELTA > 0
x = (435^(1/2)+15)/(2*7/2) or x = (15-435^(1/2))/(2*7/2)
x = (435^(1/2)+15)/7 or x = (15-435^(1/2))/7
x in { (15-435^(1/2))/7, (435^(1/2)+15)/7 }
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