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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
50*1.15^(7/x) = 0
1.15^(7/x) = 0
x należy do O
50*1.15^(7/x) = 0 <=> 50 = 0 or 50*1.15^(7/x) = 0 <=> 1.15^(7/x) = 0
x belongs to the empty set
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