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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/5-(2/x) = (2/5)*x // - (2/5)*x
3/5-((2/5)*x)-(2/x) = 0
(-2/5)*x-2*x^-1+3/5 = 0
3/5*x^0-2/5*x^1-2*x^-1 = 0
(3/5*x^1-2/5*x^2-2*x^0)/(x^1) = 0 // * x^2
x^1*(3/5*x^1-2/5*x^2-2*x^0) = 0
x^1
(-2/5)*x^2+(3/5)*x-2 = 0
(-2/5)*x^2+(3/5)*x-2 = 0
DELTA = (3/5)^2-(-2*4*(-2/5))
DELTA = -71/25
DELTA < 0
x in { }
x belongs to the empty set
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