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D( x )
ln(7) = 0
ln(7) = 0
ln(7) = 0
t_1 = ln(7)
ln(7) = 0
t_1 = 0
x naleu017Cy do R
x in (-oo:+oo)
x belongs to the empty set
x = 4-(ln(57)/ln(7))
x belongs to the empty set
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