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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x^-2)/3-((7*x^-1)/3)+5 = 0
(-7/3)*x^-1+(2*x^-2)/3+5 = 0
2/3*x^-2-7/3*x^-1+5 = 0
t_1 = x^-1
2/3*t_1^2-7/3*t_1^1+5 = 0
2/3*t_1^2-7/3*t_1+5 = 0
DELTA = (-7/3)^2-(2/3*4*5)
DELTA = -71/9
DELTA < 0
x belongs to the empty set
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