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D( r )
r = 0
r^17 = 0
r = 0
r = 0
r^17 = 0
r^17 = 0
1*r^17 = 0 // : 1
r^17 = 0
r = 0
r in (-oo:0) U (0:+oo)
(r^-6)/(r^17) = 0
1*r^-23 = 0 // : 1
r^-23 = 0
r naleu017Cy do O
r belongs to the empty set
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