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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x = (6/5)*x // - (6/5)*x
10/x-((6/5)*x) = 0
(-6/5)*x+10/x = 0
10*x^-1-6/5*x^1 = 0
(10*x^0-6/5*x^2)/(x^1) = 0 // * x^2
x^1*(10*x^0-6/5*x^2) = 0
x^1
(-6/5)*x^2+10 = 0
(-6/5)*x^2+10 = 0
DELTA = 0^2-(4*10*(-6/5))
DELTA = 48
DELTA > 0
x = (48^(1/2)+0)/(2*(-6/5)) or x = (0-48^(1/2))/(2*(-6/5))
x = -5/3*3^(1/2) or x = 5/3*3^(1/2)
x in { -5/3*3^(1/2), 5/3*3^(1/2)}
x in { -5/3*3^(1/2), 5/3*3^(1/2) }
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