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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)
x-(1/(x^6)) = 0
x-x^-6 = 0
x-x^-6 = 0
x*(1-x^-7) = 0
-1*x^-7 = -1 // : -1
x^-7 = 1
-7 < 0
1/(x^7) = 1 // * x^7
1 = 1*x^7 // : 1
1 = x^7
x^7 = 1 // ^ 1/7
x = 1
x = 0
x = 0
x in { 0}
x = 1
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