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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-5*x+25/4 = 0
1*x^-4 = -25/4 // : 1
x^-4 = -25/4
-4 < 0
1/(x^4) = -25/4 // * x^4
1 = -25/4*x^4 // : -25/4
-4/25 = x^4
x belongs to the empty set
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