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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^-5)/2-57 = 186 // - 186
(x^-5)/2-186-57 = 0
1/2*x^-5 = 243 // : 1/2
x^-5 = 486
-5 < 0
1/(x^5) = 486 // * x^5
1 = 486*x^5 // : 486
1/486 = x^5
x^5 = 1/486 // ^ 1/5
x = (1/486)^(1/5)
x = (1/486)^(1/5)
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