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D( x )
x^1 = 0
x = 0
x^1 = 0
x^1 = 0
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(((((x^-1)/4)*x^5)/4)/(x^1))/3 = 0
(((((x^-1)/4)*x^5)/4)/x)/3 = 0
1/48*x^3 = 0 // : 1/48
x^3 = 0
x = 0
x in { 0}
x belongs to the empty set
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