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D( x )
e^4*x = 0
e^4*x = 0
e^4*x = 0
e^4*x = 0 // : e^4
x = 0
x in (-oo:0) U (0:+oo)
1/(e^4*x) = 0
(1/(e^4))*x^-1 = 0 // : 1/(e^4)
x^-1 = 0
x należy do O
x belongs to the empty set
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