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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
e^-1 = (x-6)/x // - (x-6)/x
e^-1-((x-6)/x) = 0
(-1*(x-6))/x+e^-1 = 0
(-1*(x-6))/x+(e^-1*x)/x = 0
e^-1*x-1*(x-6) = 0
(e^-1-1)*x+6 = 0
((e^-1-1)*x+6)/x = 0
((e^-1-1)*x+6)/x = 0 // * x
(e^-1-1)*x+6 = 0
(e^-1-1)*x+6 = 0 // - 6
(e^-1-1)*x = -6 // : e^-1-1
x = -6/(e^-1-1)
x = -6/(e^-1-1)
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