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D( x )
(-5)^-3*x^(5^5) = 0
(-5)^-3*x^(5^5) = 0
(-5)^-3*x^(5^5) = 0
-1/125*x^3125 = 0 // : -1/125
x^3125 = 0
x = 0
x in (-oo:0) U (0:+oo)
((-5)^-2)/((-5)^-3*x^(5^5)) = 0
-5*x^-3125 = 0 // : -5
x^-3125 = 0
x naleu017Cy do O
x belongs to the empty set
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