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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-((6/5)*x)+1 = x+5/x // - x+5/x
x-((6/5)*x)-x-(5/x)+1 = 0
x+(-6/5)*x-x-5*x^-1+1 = 0
1*x^0-6/5*x^1-5*x^-1 = 0
(1*x^1-6/5*x^2-5*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^1-6/5*x^2-5*x^0) = 0
x^1
(-6/5)*x^2+x-5 = 0
(-6/5)*x^2+x-5 = 0
DELTA = 1^2-(-5*4*(-6/5))
DELTA = -23
DELTA < 0
x in { }
x belongs to the empty set
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