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D( x )
x = 0
x^5 = 0
x = 0
x = 0
x^5 = 0
x^5 = 0
1*x^5 = 0 // : 1
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
16-(((x^2)/(x^5))/4)-(x/x) = 0
(-1/4)*x^-3-1+16 = 0
-1/4*x^-3 = -15 // : -1/4
x^-3 = 60
-3 < 0
1/(x^3) = 60 // * x^3
1 = 60*x^3 // : 60
1/60 = x^3
x^3 = 1/60 // ^ 1/3
x = (1/60)^(1/3)
x = (1/60)^(1/3)
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