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6*x^2-x-((15/3)*x)-15 = 0
6*x^2-x-5*x-15 = 0
6*x^2-6*x-15 = 0
DELTA = (-6)^2-(-15*4*6)
DELTA = 396
DELTA > 0
x = (396^(1/2)+6)/(2*6) or x = (6-396^(1/2))/(2*6)
x = (6*11^(1/2)+6)/12 or x = (6-6*11^(1/2))/12
x in { (6-6*11^(1/2))/12, (6*11^(1/2)+6)/12 }
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