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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5/2)*x+5/x = 2*6*x // - 2*6*x
(5/2)*x-(2*6*x)+5/x = 0
(5/2)*x-12*x+5/x = 0
5*x^-1-19/2*x^1 = 0
(5*x^0-19/2*x^2)/(x^1) = 0 // * x^2
x^1*(5*x^0-19/2*x^2) = 0
x^1
(-19/2)*x^2+5 = 0
(-19/2)*x^2+5 = 0
DELTA = 0^2-(4*5*(-19/2))
DELTA = 190
DELTA > 0
x = (190^(1/2)+0)/(2*(-19/2)) or x = (0-190^(1/2))/(2*(-19/2))
x = (190^(1/2))/(-19) or x = (190^(1/2))/19
x in { (190^(1/2))/(-19), (190^(1/2))/19}
x in { (190^(1/2))/(-19), (190^(1/2))/19 }
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