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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x-(((5/6)/3)*x)-15 = 0
(-5/18)*x+3/x-15 = 0
3*x^-1-5/18*x^1-15*x^0 = 0
(3*x^0-5/18*x^2-15*x^1)/(x^1) = 0 // * x^2
x^1*(3*x^0-5/18*x^2-15*x^1) = 0
x^1
(-5/18)*x^2-15*x+3 = 0
(-5/18)*x^2-15*x+3 = 0
DELTA = (-15)^2-(3*4*(-5/18))
DELTA = 685/3
DELTA > 0
x = ((685/3)^(1/2)+15)/(2*(-5/18)) or x = (15-(685/3)^(1/2))/(2*(-5/18))
x = -9/5*((685/3)^(1/2)+15) or x = -9/5*(15-(685/3)^(1/2))
x in { -9/5*((685/3)^(1/2)+15), -9/5*(15-(685/3)^(1/2))}
x in { -9/5*((685/3)^(1/2)+15), -9/5*(15-(685/3)^(1/2)) }
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