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D( x )
e^5 = 0
e^5 = 0
e^5 = 0
e^5 = 0
x belongs to the empty set
x in (-oo:+oo)
(D/(e^5))*d*f*((5*e^5*f)/4) = 0
5/4*D*d*f^2 = 0
x należy do R
x in (-oo:+oo)
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