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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x = (-7/3)*x+9 // - (-7/3)*x+9
10/x-((-7/3)*x)-9 = 0
(7/3)*x+10/x-9 = 0
7/3*x^1+10*x^-1-9*x^0 = 0
(7/3*x^2-9*x^1+10*x^0)/(x^1) = 0 // * x^2
x^1*(7/3*x^2-9*x^1+10*x^0) = 0
x^1
(7/3)*x^2-9*x+10 = 0
(7/3)*x^2-9*x+10 = 0
DELTA = (-9)^2-(4*10*(7/3))
DELTA = -37/3
DELTA < 0
x in { }
x belongs to the empty set
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