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D( x )
e^3*x = 0
e^3*x = 0
e^3*x = 0
e^3*x = 0 // : e^3
x = 0
x in (-oo:0) U (0:+oo)
(9*x-6)/(e^3*x) = 0
9*x-6 = 0 // + 6
9*x = 6 // : 9
x = 6/9
x = 2/3
x = 2/3
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