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D( x )
x < 0
26.98*x^2 = 0
x < 0
26.98*x^2 = 0
26.98*x^2 = 0
26.98*x^2 = 0 // : 26.98
x^2 = 0
x = 0
x in (0:+oo)
(25*x^3*x^15.999)/(26.98*x^2) = 0
0.92661231*x^16.999 = 0 // : 0.92661231
x^16.999 = 0
x = 0
x in { 0}
x belongs to the empty set
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