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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x-1)/x = e^3 // - e^3
(5*x-1)/x-e^3 = 0
(5*x-1)/x+(-e^3*x)/x = 0
5*x-e^3*x-1 = 0
(5-e^3)*x-1 = 0
((5-e^3)*x-1)/x = 0
((5-e^3)*x-1)/x = 0 // * x
(5-e^3)*x-1 = 0
(5-e^3)*x-1 = 0 // + 1
(5-e^3)*x = 1 // : 5-e^3
x = 1/(5-e^3)
x = 1/(5-e^3)
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