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(x^2)/3-((2*x^1)/3)-15 = 0
(x^2)/3+(-2/3)*x-15 = 0
1/3*x^2-2/3*x-15 = 0
DELTA = (-2/3)^2-(-15*1/3*4)
DELTA = 184/9
DELTA > 0
x = ((184/9)^(1/2)+2/3)/(1/3*2) or x = (2/3-(184/9)^(1/2))/(1/3*2)
x = 3/2*((184/9)^(1/2)+2/3) or x = 3/2*(2/3-(184/9)^(1/2))
x in { 3/2*(2/3-(184/9)^(1/2)), 3/2*((184/9)^(1/2)+2/3) }
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