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D( x )
x = 0
((5*x)/2)*x+4 = 0
x = 0
x = 0
((5*x)/2)*x+4 = 0
((5*x)/2)*x+4 = 0
5/2*x^2 = -4 // : 5/2
x^2 = -8/5
x in (-oo:0) U (0:+oo)
((2*x)/x-1)/(((5*x)/2)*x+4) = 0
1/(5/2*x^2+4) = 0
x belongs to the empty set
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