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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x+4 = (12/5)*x-13 // - (12/5)*x-13
6/x-((12/5)*x)+4+13 = 0
(-12/5)*x+6/x+4+13 = 0
6*x^-1-12/5*x^1+17*x^0 = 0
(17*x^1-12/5*x^2+6*x^0)/(x^1) = 0 // * x^2
x^1*(17*x^1-12/5*x^2+6*x^0) = 0
x^1
(-12/5)*x^2+17*x+6 = 0
(-12/5)*x^2+17*x+6 = 0
DELTA = 17^2-(4*6*(-12/5))
DELTA = 1733/5
DELTA > 0
x = ((1733/5)^(1/2)-17)/(2*(-12/5)) or x = (-(1733/5)^(1/2)-17)/(2*(-12/5))
x = -5/24*((1733/5)^(1/2)-17) or x = 5/24*((1733/5)^(1/2)+17)
x in { -5/24*((1733/5)^(1/2)-17), 5/24*((1733/5)^(1/2)+17)}
x in { -5/24*((1733/5)^(1/2)-17), 5/24*((1733/5)^(1/2)+17) }
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