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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-3/x = (7/3)*x-3 // - (7/3)*x-3
3-((7/3)*x)-3/x = 0
(-7/3)*x-3/x+3 = 0
3*x^0-7/3*x^1-3*x^-1 = 0
(3*x^1-7/3*x^2-3*x^0)/(x^1) = 0 // * x^2
x^1*(3*x^1-7/3*x^2-3*x^0) = 0
x^1
(-7/3)*x^2+3*x-3 = 0
(-7/3)*x^2+3*x-3 = 0
DELTA = 3^2-(-3*4*(-7/3))
DELTA = -19
DELTA < 0
x in { }
x belongs to the empty set
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