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D( r )
r^39 = 0
r^39 = 0
r^39 = 0
1*r^39 = 0 // : 1
r^39 = 0
r = 0
r in (-oo:0) U (0:+oo)
(6/13)/(r^39) = 0
6/13*r^-39 = 0 // : 6/13
r^-39 = 0
r należy do O
r belongs to the empty set
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