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D( x )
e^(3*x) = 0
e^(3*x) = 0
e^(3*x) = 0
x należy do O
x in (-oo:+oo)
-9/(e^(3*x)) = 0
-9/(e^(3*x)) = 0 // * e^(3*x)
-9 = 0
x belongs to the empty set
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