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D( x )
5*x^4 = 0
5*x^4 = 0
5*x^4 = 0
5*x^4 = 0 // : 5
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(7*x^3)/(5*x^4) = 0
7/5*x^-1 = 0 // : 7/5
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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