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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
13/d = 7 // - 7
13/d-7 = 0
13*d^-1 = 7 // : 13
d^-1 = 7/13
-1 < 0
1/(d^1) = 7/13 // * d^1
1 = 7/13*d^1 // : 7/13
13/7 = d^1
d = 13/7
d = 13/7
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