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D( x )
e^-4 = 0
e^-4 = 0
e^-4 = 0
e^-4 = 0
x belongs to the empty set
x in (-oo:+oo)
(1*e^3*x)/(e^-4) = e^5*x // - e^5*x
(1*e^3*x)/(e^-4)-(e^5*x) = 0
(e^3*x)/(e^-4)-(e^5*x) = 0
(e^7-e^5)*x = 0 // : e^7-e^5
x = 0
x = 0
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