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D( x )
x^5 = 0
x^5 = 0
x^5 = 0
1*x^5 = 0 // : 1
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
Y = 7/(x^5) // - 7/(x^5)
Y-(7/(x^5)) = 0
Y-7*x^-5 = 0
-7*x^-5 = -Y // : -7
x^-5 = Y/7
-5 < 0
1/(x^5) = Y/7 // * x^5
1 = (Y/7)*x^5 // : Y/7
7*Y^-1 = x^5
x^5 = 7*Y^-1 // ^ 1/5
x = 7^(1/5)*Y^(-1/5)
x = 7^(1/5)*Y^(-1/5)
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