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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5/2)*x-(1/x) = 6 // - 6
(5/2)*x-(1/x)-6 = 0
(5/2)*x-x^-1-6 = 0
5/2*x^1-1*x^-1-6*x^0 = 0
(5/2*x^2-6*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(5/2*x^2-6*x^1-1*x^0) = 0
x^1
(5/2)*x^2-6*x-1 = 0
(5/2)*x^2-6*x-1 = 0
DELTA = (-6)^2-(-1*4*(5/2))
DELTA = 46
DELTA > 0
x = (46^(1/2)+6)/(2*(5/2)) or x = (6-46^(1/2))/(2*(5/2))
x = (46^(1/2)+6)/5 or x = (6-46^(1/2))/5
x in { (6-46^(1/2))/5, (46^(1/2)+6)/5}
x in { (6-46^(1/2))/5, (46^(1/2)+6)/5 }
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