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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/6-((2/3)*x) = 4/x // - 4/x
7/6-((2/3)*x)-(4/x) = 0
(-2/3)*x-4*x^-1+7/6 = 0
7/6*x^0-2/3*x^1-4*x^-1 = 0
(7/6*x^1-2/3*x^2-4*x^0)/(x^1) = 0 // * x^2
x^1*(7/6*x^1-2/3*x^2-4*x^0) = 0
x^1
(-2/3)*x^2+(7/6)*x-4 = 0
(-2/3)*x^2+(7/6)*x-4 = 0
DELTA = (7/6)^2-(-4*4*(-2/3))
DELTA = -335/36
DELTA < 0
x in { }
x belongs to the empty set
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