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D( R )
R^12 = 0
R^12 = 0
R^12 = 0
1*R^12 = 0 // : 1
R^12 = 0
R = 0
R in (-oo:0) U (0:+oo)
(R^7)/(R^12) = 0
1*R^-5 = 0 // : 1
R^-5 = 0
R należy do O
R belongs to the empty set
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