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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(2/x) = (14/5)*x-(1/5) // - (14/5)*x-(1/5)
1/5-((14/5)*x)-(2/x)+1 = 0
(-14/5)*x-2*x^-1+1/5+1 = 0
6/5*x^0-14/5*x^1-2*x^-1 = 0
(6/5*x^1-14/5*x^2-2*x^0)/(x^1) = 0 // * x^2
x^1*(6/5*x^1-14/5*x^2-2*x^0) = 0
x^1
(-14/5)*x^2+(6/5)*x-2 = 0
(-14/5)*x^2+(6/5)*x-2 = 0
DELTA = (6/5)^2-(-2*4*(-14/5))
DELTA = -524/25
DELTA < 0
x in { }
x belongs to the empty set
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