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D( x )
x^6 = 0
x^6 = 0
x^6 = 0
1*x^6 = 0 // : 1
x^6 = 0
x = 0
x in (-oo:0) U (0:+oo)
7381 = -5/(x^6) // + -5/(x^6)
7381-(-5/(x^6)) = 0
5*x^-6+7381 = 0
5*x^-6 = -7381 // : 5
x^-6 = -7381/5
-6 < 0
1/(x^6) = -7381/5 // * x^6
1 = -7381/5*x^6 // : -7381/5
-5/7381 = x^6
x belongs to the empty set
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